We have three blocks. We call them A, B and C. Block A is to the right of block B and above block C. Block A has a medium yellow square. Block B contains a medium yellow square. And block C contains two medium black squares. Medium black square number one is below a medium blue square. Medium black square number two is below the medium blue square. A medium yellow square is below medium black square number two , medium black square number one and the medium blue square.
Which object is above a medium yellow 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