There are three blocks. Lets call them A, B and C. Block C is to the left of A. Block B is above C. Block A contains two medium black squares. Below medium black square number two is medium black square number one. Block B has one medium blue square. This block also has a medium black square. Below the medium black square there is the medium blue square. And block C has one medium blue square.
Which object is above a medium blue square? medium black square number two or the medium black square that is in block B?
medium black square  number two the medium black square  that is in block B both of them none of them