There are three blocks. Lets call them A, B and C. Block C is above blocks B and A. Block A has two medium yellow squares. Below medium yellow square number two and a medium black square there is medium yellow square number one. The medium black square is below medium yellow square number two. Block B has a medium black square. Block C contains one medium black square.
Which object is below 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