We have three blocks, A, B and C. Blocks B and A are above C. Block A contains two medium black squares. Medium black square number one is below medium black square number two and a medium yellow square. Medium black square number two is below the medium yellow square. Block B has two medium blue squares. Medium blue square number one is touching the bottom edge of this block. It is below medium blue square number two. And block C has a medium blue square.
What is below the yellow object? a medium black square number two or a medium black square number one?
medium black square  number two medium black square  number one both of them none of them