WORKED EXAMPLE. Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position? Work through the method: 1) note which half folds onto which half, and where the crease line is; 2) find the punched hole's distance from each edge of the original square; 3) to unfold, reflect the hole across the fold line only (the distance from the crease stays the same on both sides; the distance along the crease does not change); 4) check the total number of holes matches the number of layers that were punched through.
(Total for Question 1 is 0 marks)
2
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 2 is 1 mark)
3
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 3 is 1 mark)
4
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 4 is 1 mark)
5
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 5 is 1 mark)
6
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 6 is 1 mark)
7
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 7 is 1 mark)
8
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 8 is 1 mark)
9
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 9 is 1 mark)
10
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 10 is 1 mark)
11
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 11 is 1 mark)
12
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 12 is 1 mark)
13
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 13 is 1 mark)
14
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 14 is 1 mark)
15
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 15 is 1 mark)
16
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 16 is 1 mark)
17
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 17 is 1 mark)
18
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 18 is 1 mark)
19
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 19 is 1 mark)
20
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 20 is 1 mark)
21
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 21 is 1 mark)
22
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 22 is 1 mark)
23
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 23 is 1 mark)
24
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 24 is 1 mark)
25
Study the square sheet of paper described below. It is folded as described, in the direction shown by the arrow(s), and a hole (or holes) is punched through all the layers at the point(s) marked. Which of the options A to E shows the sheet of paper fully opened out flat again, with every resulting hole shown in its correct position?
(Total for Question 25 is 1 mark)
Mark scheme · EP.N12 Fold and Punch
Question 1
B1 Option B is correct: the crease (fold line) is vertical, 3cm from the left edge, so unfolding reflects the hole left-right only, keeping its height (2cm up) unchanged: holes at 1cm and 5cm from the left edge, both 2cm up. Option A shows only the punched hole with no reflection (the paper has not really been unfolded). Option C wrongly adds a second, vertical reflection as though a horizontal fold had also been made. Option D reflects the height instead of the side-to-side position (the wrong axis). Option E swaps the two measurements (1cm and 2cm) before reflecting, putting the holes in the wrong place.
Answer: Option B
Question 2
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option B is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 4cm from the left edge and 1.5cm from the bottom edge; one centred 2cm from the left edge and 1.5cm from the bottom edge. Option C is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option D is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option B
Question 3
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option B is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option C is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option D is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 2cm from the left edge and 4.5cm from the bottom edge; one centred 2cm from the left edge and 1.5cm from the bottom edge. Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option D
Question 4
B1 Option A is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 1.5cm from the left edge and 4cm from the bottom edge; one centred 4.5cm from the left edge and 4cm from the bottom edge. Option B is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option C is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option D is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option A
Question 5
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option B is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option C is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option D is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation. Option E is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 4.5cm from the left edge and 2cm from the bottom edge; one centred 4.5cm from the left edge and 4cm from the bottom edge.
Answer: Option E
Question 6
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option B is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option C is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 2.5cm from the left edge and 1.5cm from the bottom edge; one centred 3.5cm from the left edge and 1.5cm from the bottom edge. Option D is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option C
Question 7
B1 Option A is correct: exactly one solid black hole (0.6cm diameter), centred 3cm from the left edge and 2cm from the bottom edge. Option B is wrong: it wrongly treats the hole as if it were off the fold line, showing two separate holes either side of the crease. Option C is wrong: it wrongly mirrors the hole in a second, non-existent, fold direction as well, giving two holes spaced apart along the true fold line. Option D is wrong: it swaps the two measurements before placing the hole, so the single hole ends up in the wrong position. Option E is wrong: it shows a blank square with no holes at all, wrongly assuming a hole punched exactly on the crease vanishes when the paper is unfolded.
Answer: Option A
Question 8
B1 Option A is wrong: it wrongly treats the hole as if it were off the fold line, showing two separate holes either side of the crease. Option B is wrong: it wrongly mirrors the hole in a second, non-existent, fold direction as well, giving two holes spaced apart along the true fold line. Option C is correct: exactly one solid black hole (0.6cm diameter), centred 4cm from the left edge and 3cm from the bottom edge. Option D is wrong: it swaps the two measurements before placing the hole, so the single hole ends up in the wrong position. Option E is wrong: it shows a blank square with no holes at all, wrongly assuming a hole punched exactly on the crease vanishes when the paper is unfolded.
Answer: Option C
Question 9
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added across the diagonal fold line. Option B is wrong: it reflects the hole across the OTHER diagonal of the square instead of the actual fold line. Option C is wrong: it reflects the hole using a straight (vertical) mirror line instead of the diagonal fold line. Option D is wrong: it shows the two correctly mirrored holes plus an extra phantom hole added exactly on the diagonal fold line. Option E is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 4cm from the bottom edge; one centred 4cm from the left edge and 1cm from the bottom edge.
Answer: Option E
Question 10
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added across the diagonal fold line. Option B is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 2cm from the bottom edge; one centred 4cm from the left edge and 5cm from the bottom edge. Option C is wrong: it reflects the hole across the OTHER diagonal of the square instead of the actual fold line. Option D is wrong: it reflects the hole using a straight (vertical) mirror line instead of the diagonal fold line. Option E is wrong: it shows the two correctly mirrored holes plus an extra phantom hole added exactly on the diagonal fold line.
Answer: Option B
Question 11
B1 Option A is wrong: it shows only the two original punched holes, with neither one reflected across the fold line. Option B is wrong: it reflects only one of the two punched holes across the fold line, and omits the mirror image of the other. Option C is wrong: it reflects both holes, but across the wrong axis of the square. Option D is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 1cm from the bottom edge; one centred 5cm from the left edge and 1cm from the bottom edge; one centred 2cm from the left edge and 4cm from the bottom edge; one centred 4cm from the left edge and 4cm from the bottom edge. Option E is wrong: it shows all four correctly mirrored holes plus an extra phantom hole added on the fold line.
Answer: Option D
Question 12
B1 Option A is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 2cm from the left edge and 4cm from the bottom edge; one centred 2cm from the left edge and 2cm from the bottom edge; one centred 4cm from the left edge and 5cm from the bottom edge; one centred 4cm from the left edge and 1cm from the bottom edge. Option B is wrong: it shows only the two original punched holes, with neither one reflected across the fold line. Option C is wrong: it reflects only one of the two punched holes across the fold line, and omits the mirror image of the other. Option D is wrong: it reflects both holes, but across the wrong axis of the square. Option E is wrong: it shows all four correctly mirrored holes plus an extra phantom hole added on the fold line.
Answer: Option A
Question 13
B1 Option A is wrong: it reflects the hole across only one of the two fold lines, giving two holes instead of four. Option B is wrong: it shows only the single original punched hole, with no reflection across either fold line. Option C is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 2cm from the bottom edge; one centred 5cm from the left edge and 2cm from the bottom edge; one centred 1cm from the left edge and 4cm from the bottom edge; one centred 5cm from the left edge and 4cm from the bottom edge. Option D is wrong: it confuses the double straight fold with a single diagonal fold, giving only two holes with the measurements swapped. Option E is wrong: it swaps the two measurements before reflecting across both fold lines, giving four holes in the wrong positions.
Answer: Option C
Question 14
B1 Option A is wrong: it shows only the single original punched hole, with no reflection across the free fold line. Option B is wrong: it wrongly treats the hole as being off both fold lines, giving four separate holes instead of two. Option C is wrong: it wrongly mirrors the measurement that lies exactly on the fold line, instead of the other one. Option D is wrong: it shows the two correctly mirrored holes plus an extra phantom hole added at the exact centre of the square. Option E is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 3cm from the left edge and 1cm from the bottom edge; one centred 3cm from the left edge and 5cm from the bottom edge.
Answer: Option E
Question 15
B1 Option A is wrong: it shows a blank square with no holes at all, wrongly assuming a hole at the very centre vanishes when unfolded. Option B is correct: exactly one solid black hole (0.6cm diameter), centred 3cm from the left edge and 3cm from the bottom edge. Option C is wrong: it wrongly treats the hole as being off both fold lines, giving four separate holes instead of one. Option D is wrong: it shows a single hole, but in the wrong position, from misjudging the distances from the edges. Option E is wrong: it wrongly treats the hole as being on only one of the two fold lines, giving two holes instead of one.
Answer: Option B
Question 16
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option B is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option C is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option D is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 5.5cm from the left edge and 0.5cm from the bottom edge; one centred 0.5cm from the left edge and 0.5cm from the bottom edge. Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option D
Question 17
B1 Option A is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 0.5cm from the left edge and 5.5cm from the bottom edge; one centred 0.5cm from the left edge and 0.5cm from the bottom edge. Option B is wrong: it shows only the single punched hole, with no mirror-image hole added when the paper is unfolded. Option C is wrong: it shows the two correctly mirrored holes but with an extra phantom hole added exactly on the fold line. Option D is wrong: it mirrors the wrong measurement (the distance that should stay fixed has been flipped, and the distance that should be flipped has been kept fixed). Option E is wrong: it swaps the two measurements (distance from the left edge and distance from the bottom edge) before mirroring, so the whole hole pattern is in the wrong orientation.
Answer: Option A
Question 18
B1 Option A is wrong: it omits the hole that lies exactly on the fold line altogether, showing only the two reflected holes. Option B is wrong: it wrongly mirrors the on-line hole in a second direction as well, giving four holes in total. Option C is correct: exactly 3 solid black holes (each 0.6cm diameter): one centred 3cm from the left edge and 1cm from the bottom edge; one centred 1cm from the left edge and 4cm from the bottom edge; one centred 5cm from the left edge and 4cm from the bottom edge. Option D is wrong: it forgets to reflect the off-line hole across the fold line, showing only the two original punched holes. Option E is wrong: it shows the three correct holes plus an extra phantom hole added on the fold line.
Answer: Option C
Question 19
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added across the diagonal fold line. Option B is wrong: it reflects the hole across the OTHER diagonal of the square instead of the actual fold line. Option C is wrong: it reflects the hole using a straight (vertical) mirror line instead of the diagonal fold line. Option D is wrong: it shows the two correctly mirrored holes plus an extra phantom hole added exactly on the diagonal fold line. Option E is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 4cm from the left edge and 1cm from the bottom edge; one centred 1cm from the left edge and 4cm from the bottom edge.
Answer: Option E
Question 20
B1 Option A is wrong: it shows only the single punched hole, with no mirror-image hole added across the diagonal fold line. Option B is correct: exactly 2 solid black holes (each 0.6cm diameter): one centred 5cm from the left edge and 4cm from the bottom edge; one centred 2cm from the left edge and 1cm from the bottom edge. Option C is wrong: it reflects the hole across the OTHER diagonal of the square instead of the actual fold line. Option D is wrong: it reflects the hole using a straight (vertical) mirror line instead of the diagonal fold line. Option E is wrong: it shows the two correctly mirrored holes plus an extra phantom hole added exactly on the diagonal fold line.
Answer: Option B
Question 21
B1 Option A is wrong: it shows only the two original punched holes, with neither one reflected across the fold line. Option B is wrong: it reflects only one of the two punched holes across the fold line, and omits the mirror image of the other. Option C is wrong: it reflects both holes, but across the wrong axis of the square. Option D is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 1cm from the bottom edge; one centred 1cm from the left edge and 5cm from the bottom edge; one centred 4cm from the left edge and 2cm from the bottom edge; one centred 4cm from the left edge and 4cm from the bottom edge. Option E is wrong: it shows all four correctly mirrored holes plus an extra phantom hole added on the fold line.
Answer: Option D
Question 22
B1 Option A is correct: exactly 8 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 2cm from the bottom edge; one centred 5cm from the left edge and 2cm from the bottom edge; one centred 1cm from the left edge and 4cm from the bottom edge; one centred 5cm from the left edge and 4cm from the bottom edge; one centred 2cm from the left edge and 1cm from the bottom edge; one centred 4cm from the left edge and 1cm from the bottom edge; one centred 2cm from the left edge and 5cm from the bottom edge; one centred 4cm from the left edge and 5cm from the bottom edge. Option B is wrong: it reflects both holes across only one of the two fold lines, giving four holes instead of eight. Option C is wrong: it shows only the two original punched holes, with no reflection across either fold line. Option D is wrong: it reflects one hole fully across both fold lines but leaves the other hole completely unreflected. Option E is wrong: it shows all eight correctly mirrored holes plus an extra phantom hole added at the centre of the square.
Answer: Option A
Question 23
B1 Option A is wrong: it reflects only one of the two punched holes across the diagonal, and omits the mirror image of the other. Option B is wrong: it reflects both holes across the OTHER diagonal of the square instead of the actual fold line. Option C is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 1cm from the left edge and 3cm from the bottom edge; one centred 3cm from the left edge and 1cm from the bottom edge; one centred 2cm from the left edge and 5cm from the bottom edge; one centred 5cm from the left edge and 2cm from the bottom edge. Option D is wrong: it reflects both holes using a straight (vertical) mirror line instead of the diagonal fold line. Option E is wrong: it shows all four correctly mirrored holes plus an extra phantom hole added on the diagonal fold line.
Answer: Option C
Question 24
B1 Option A is wrong: it reflects only one of the two punched holes across the diagonal, and omits the mirror image of the other. Option B is wrong: it reflects both holes across the OTHER diagonal of the square instead of the actual fold line. Option C is wrong: it reflects both holes using a straight (vertical) mirror line instead of the diagonal fold line. Option D is wrong: it shows all four correctly mirrored holes plus an extra phantom hole added on the diagonal fold line. Option E is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 5cm from the left edge and 3cm from the bottom edge; one centred 3cm from the left edge and 1cm from the bottom edge; one centred 4cm from the left edge and 5cm from the bottom edge; one centred 1cm from the left edge and 2cm from the bottom edge.
Answer: Option E
Question 25
B1 Option A is wrong: it reflects the hole across only one of the two fold lines, giving two holes instead of four. Option B is correct: exactly 4 solid black holes (each 0.6cm diameter): one centred 0.5cm from the left edge and 1cm from the bottom edge; one centred 5.5cm from the left edge and 1cm from the bottom edge; one centred 0.5cm from the left edge and 5cm from the bottom edge; one centred 5.5cm from the left edge and 5cm from the bottom edge. Option C is wrong: it shows only the single original punched hole, with no reflection across either fold line. Option D is wrong: it misjudges the distance of the hole from the edge, giving four holes in slightly the wrong positions. Option E is wrong: it swaps the two measurements before reflecting across both fold lines, giving four holes in the wrong positions.