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