A model uses unit cubes on a 2 by 3 grid (2 rows front to back, 3 columns left to right). The plan has a cube in every cell. The front elevation (columns left to right) shows heights 1, 3, 2. The side elevation (rows front to back) shows heights 3, 2. Give heights for each cell (front row left to right, then back row left to right) that satisfy these views, and find the total number of unit cubes in the model.
(Total for Question 9 is 4 marks)