There are three blocks. Lets call them A, B and C. There is one medium black square in block A. Block B is to the left of block A. It contains a medium black square and a medium yellow square. The medium black square is below the medium yellow square and a medium blue square. Below the medium blue square is the medium yellow square. Finally, we have block C below block B. It contains two medium blue squares. Below medium blue square number two is medium blue square number one.
Which object is to the left of a medium black square? medium blue square number two or medium blue square number one?
medium blue square  number two medium blue square  number one both of them none of them