The solution presented for the assignment is different than the expected solution.
The assignment asks to draw 6 squares and to arrange them in 3 x 3 rows and coloumns.
However, the sample solution shows 9 squares arranged in 3 x 3 manner.
Kindly note, it isn't possible to arrange 6 squares in 3 x 3 manner.
Inkscape Align-and-distribute-objects 0-1 min 0-10 sec
We will correct the assignment and upload the tutorial.