There are two blocks. We call them A and B. Block A is to the left of B. Block A contains a big black circle. A medium yellow triangle is above the big black circle. Block B has one medium black circle, one medium black square and a small blue circle. To the right of the medium black square and a small yellow triangle there is the medium black circle. The medium black square is above the small yellow triangle. It is to the left of the small blue circle.
What is to the left of the blue object? a medium black circle or a square?
medium black circle  square  both of them none of them