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