Three blocks, named AAA, BBB and CCC exist. Block CCC and block AAA has block BBB. Block BBB has a medium blue square. A medium black square is covered by this block. Block CCC contain two medium black squares. A medium yellow thing is covered by this block. Medium black square number two is to the north of this thing and touches medium black square number one. Medium black square number one is to the north of this shape.
Do all blocks contain the medium blue square?