There are three blocks, A, B and C. Block C is below and B is above A. Block A contains a medium black square. Block B has one medium yellow square. And block C contains two medium black squares. This block also contains one medium blue square. This object is below medium black square number two. Medium black square number one is below the medium blue square and medium black square number two.
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