There are two blocks. Lets call them A and B. Block A contains two medium black squares. Medium black square number one is below medium black square number two. Block B is to the right of block A. It contains a medium blue square and a medium black square. The medium blue square is below the medium black square and a medium yellow square. The medium black square is below the medium yellow square.
What is to the left of the yellow object? a medium black square or a blue thing?
medium black square  blue thing both of them none of them