We have three blocks. We call them A, B and C. Block C is below blocks B and A. Block A has one medium black square. Block B contains a medium black square. The medium black square is below a medium blue square. Block C contains a medium black square and one medium yellow square. The medium black square is below the medium yellow square.
What is below the blue thing? a yellow object or a medium black square?
yellow object medium black square  both of them none of them