There exist three blocks, named AAA, BBB and CCC. A medium yellow square is inside and touching and a medium black square is within block AAA. The medium yellow square is south of the medium black square. North of and far from block AAA is block BBB. Block AAA is disconnected from and in front of this block. A medium black square is covered by block BBB. South of and in front of block BBB is block CCC. This block covers a medium blue square. Another medium blue square is within this block.
Does a block contain any medium blue square?