There are two blocks. Lets call them A and B. There are one medium blue square and one medium black square in block A. Below the medium black square is the medium blue square. This block also contains one medium yellow square. The medium yellow square is below the medium black square and the medium blue square. Below block A there is block B which has one medium yellow square and one medium black square. Below the medium black square is the medium yellow square.
Are all medium black squares above a medium yellow square?