There are three blocks. Lets call them A, B and C. One small blue circle and one medium yellow square are in block A. The small blue circle is touching the right edge of this block. It is below and to the right of the medium yellow square. Block B is to the left of block A. It contains one small black triangle. To the right of and below the small black triangle is a medium black triangle. Finally, there is block C. It is above block B. It contains one small black triangle, a small black circle and one big black triangle. The small black triangle is to the left of a medium black square. The small black circle is below the medium black square and the big black triangle.. The big black triangle is to the left of the medium black square.
What is to the left of the medium black square? a small black circle or a small black triangle?
small black circle  small black triangle  both of them none of them