We have three blocks. Lets call them A, B and C. Block A is above blocks C and B. Block A has one medium black square. There is also a medium blue square touching the bottom edge of this block. Below the medium black square there is the medium blue square. Block B has one medium black square. The medium black square is below a medium yellow square. And block C has two medium black squares. Medium black square number one is below medium black square number two.
What is above the yellow thing? a medium black square that is in block B or a medium black square number two?
medium black square  that is in block B medium black square  number two both of them none of them