There are three blocks. Lets call them A, B and C. Block A has one medium black square. Block B is above block A. It contains a medium blue square. Below block B there is block C which has two medium blue squares. Medium blue square number one is below medium blue square number two and a medium yellow square. Medium blue square number two is below the medium yellow square.
What is above the yellow thing? a medium blue square which is in block B or a medium blue square number two?
medium blue square  which is in block B medium blue square  number two both of them none of them