There are three blocks, A, B and C. Block C is to the right of and B is to the left of A. Block A contains one medium blue square. Block B contains two medium yellow squares. Below medium yellow square number two and a medium black square there is medium yellow square number one. Below medium yellow square number two is the medium black square. Block C contains one medium black square.
Which object is to the left of 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