Example problem:
The deck measures 16 units by 16 units. There are 10 containers, in three classes:
A B C
6x8 4x4 4x8
4x6 4x4 4x8
4x4 4x6 4x6
4x6
Containers of classes B and C are constrained to be at least 4 units apart in at least one of the north-south or east-west directions.