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