We have two blocks, A and B. There are two medium black squares in block A. This block also contains one medium blue square. The medium blue square is below medium black square number two and medium black square number one. Below medium black square number two is medium black square number one. Above block A we have block B which has a medium yellow square and one medium black square. The medium yellow square is below the medium black square.
What is below the yellow object? a medium black square or a blue object which is touching the bottom edge of a block?
medium black square  blue object which is touching the bottom edge of a block  both of them none of them