There are three blocks. We call them A, B and C. Block B is to the left of C and block C is to the right of A. Block A has one medium blue square. Block B has one medium blue square. And block C contains one medium yellow square, one medium blue square and a medium black square. Below the medium blue square and the medium black square there is the medium yellow square. The medium blue square is below the medium black square.
What is above the yellow thing? a medium black square or a medium blue square?
medium black square  medium blue square  both of them none of them