There are two blocks. Lets call them A and B. Block A is above B. Block A contains one medium blue square and a medium black square. The medium blue square is below the medium black square. Block B has a medium blue square and one medium black square. The medium blue square is below the medium black square. A medium yellow square is touching the bottom edge of this block. It is below the medium black square and the medium blue square.
Which object is below a medium black square? the medium blue square that is in block A or the medium blue square that is in block B?
the medium blue square  that is in block A the medium blue square  that is in block B both of them none of them