Two blocks, called AAA and BBB exist in the image. Disconnected from block BBB is block AAA with two medium black squares. Farther from this block is block BBB. This block contains a medium blue square. A medium black square is to the north of the medium blue square. The medium black square is inside block BBB. North of this shape is another medium blue square. Medium blue square number two is inside block BBB.
Do all blocks contain a medium black square?