We have three blocks, named AAA, BBB and CCC. Disconnected from block BBB is block AAA. To the south of and east of this block there is block BBB. A medium yellow square is in block AAA. Block AAA covers a medium black square. Block BBB contains a medium blue square. To the south of a medium yellow square there is the medium blue square. The medium yellow square is in block BBB.
Is a medium square to the north of any medium blue square?