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