There are three blocks, A, B and C. Block B is below A and block C is above B. Block A contains one medium blue square. Block B has two medium black squares. It also contains one medium yellow square. This block also contains one medium blue square. Medium black square number one is below the medium blue square , the medium yellow square and medium black square number two. Below the medium blue square and the medium yellow square is medium black square number two. And block C contains a medium blue square.
Which object is below a medium blue 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