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