There are three blocks, A, B and C. There is one medium blue square in block A. To the left of block A there is block B with two medium black squares in it. Medium black square number one is below medium black square number two and a medium yellow square. Below the medium yellow square is medium black square number two. To the right of block B there is block C. It contains one medium blue square and a medium black square. There is also a medium yellow square in this block. It is below the medium black square. Below the medium yellow square and the medium black square is the medium blue square.
Which object is to the left of a medium blue square? medium black square number one or medium black square number two?
medium black square  number one medium black square  number two both of them none of them