We have two blocks, A and B. Block A is below B. Block A contains a medium blue square, one medium yellow square and one medium black square. Below the medium black square there is the medium yellow square. Below the square which is below the medium black square there is the medium blue square. It is below the medium black square. Block B has two medium blue squares. Below medium blue square number two is medium blue square number one.
What is above the yellow object? a medium blue square or a black thing?
medium blue square  black thing both of them none of them