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