"""Bonus points if you can draw pictures of the winning configurations along the way. While drawing pictures, any files sharing dimensions should be considered identical/interchangeable."""

Note in the sample output they have 4 "distinct" configurations for the minimum size (really they're all the same, just rotated). If the two small boxes weren't identical/interchangeable, there would be 8 configurations (4 pairs of two, and each pair would be indistinguishable from eachother without labeling the small boxes A and B).