We have three blocks. Lets call them A, B and C. Block A has one medium blue square and a medium yellow square. Below the medium yellow square is the medium blue square. Below block A we have block B which contains one medium blue square. Below a medium black square there is the medium blue square. Below block A there is block C which has one medium blue square.
What is above the black object? a medium blue square or a medium yellow square?
medium blue square  medium yellow square  both of them none of them