There are three blocks, A, B and C. Block B is above block C and to the left of block A. Block A has a small blue triangle. Below a small yellow square there is a big blue square. The small blue triangle is below the small yellow square. Above the triangle which is below the small yellow square is the big blue square. Block B contains a small blue triangle and a small black triangle. To the left of the small black triangle is the small blue triangle. Block C contains a small yellow triangle.
What is below the small yellow square? a black object or a small blue triangle?
black object small blue triangle  both of them none of them