There are three blocks. We call them A, B and C. Block A is to the right of B. Block C is to the left of A. Block A contains a medium black square. Block B has a medium black square and one medium blue square. Below the medium blue square is the medium black square. And block C contains two medium yellow squares. A medium blue square is touching the bottom edge of this block. Medium yellow square number one is below medium yellow square number two. The medium blue square is below medium yellow square number two and medium yellow square number one.
Which object is to the left of a medium black square? medium yellow square number one or medium yellow square number two?
medium yellow square  number one medium yellow square  number two both of them none of them