There are three blocks, A, B and C. Block A has two medium black squares. Below medium black square number two is medium black square number one. Block B is to the right of block A. It has two medium yellow squares. It also has a medium blue square. It is below medium yellow square number two. Below medium yellow square number two , the medium blue square and a medium black square is medium yellow square number one. The medium black square is below medium yellow square number two. To the right of block B there is block C with a medium blue square in it.
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