Three blocks, named AAA, BBB and CCC exist. Block CCC has block BBB. Block BBB covers block AAA. Block AAA contain two medium black squares. This block covers a medium blue square. The medium blue square touches medium black square number two. Medium black square number two is south of medium black square number one. Block BBB has a medium black square. A medium blue square is inside and touching this block. North of this object there is the medium black square. Block CCC contains a medium black square. A medium blue square touches the medium black square. The medium blue square is in block CCC.
Is a medium black square within CCC?