There are two blocks, A and B. Block A is below B. Block A has one medium black square. Block B has two medium yellow squares. Medium yellow square number one is below medium yellow square number two. Below a medium blue square there is medium yellow square number two. Below the medium blue square there is a medium black square. It is below medium yellow square number two and medium yellow square number one.
Which object is above 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