I just went to the link provided above and counted the A then B blocks. To my it looks like 25 of the A Blocks [the 16 different fabrics] and then the B Blocks is 27 with the 2 solids and the 4 patches attached.
I'm bad, I just recounted, and their are 28 of each blocks, 28 A, 28 B..........I skipped a whole row!
