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