There are two blocks. We call them A and B. Block A is below B. Block A has one medium blue square and one medium black square. The medium blue square is touching the bottom edge of this block. It is below the medium black square. Block B has two medium black squares. Medium black square number one is below medium black square number two. Medium black square number two is below a medium yellow square. Below the medium yellow square there is medium black square number one.
What is below the yellow thing? a medium black square or a medium blue square that is touching the bottom edge of a block?
medium black square  medium blue square  that is touching the bottom edge of a block  both of them none of them