There are two blocks. We call them A and B. Block A is below B. Block A contains two medium yellow squares. Medium yellow square number one is below medium yellow square number two. Below medium yellow square number one and medium yellow square number two there is a medium black square. Block B contains two medium blue squares. Below medium blue square number two there is medium blue square number one.
Which object is above a medium yellow square? medium blue square number one or medium blue square number two?
medium blue square  number one medium blue square  number two both of them none of them