There are two blocks, A and B. Block A has one medium black square and one medium yellow square. The medium black square is below the medium yellow square. Block B is above block A. It contains a medium blue square and a medium yellow square. Below a medium black square and the medium yellow square is the medium blue square. This shape is touching the bottom edge of this block. Below the medium black square there is the medium yellow square.
What is below the blue thing? a medium black square that is in block A or a medium black square that is in block B?
medium black square  that is in block A medium black square  that is in block B both of them none of them