There are three blocks. Lets call them A, B and C. Block C is below A. Block A is to the left of B. Block A has one big black triangle. To the right of and below a small yellow triangle there is the big black triangle. Block B has a medium yellow triangle. The medium yellow triangle is touching the bottom edge of this block. This block also has a small black square. Below the small black square there is the medium yellow triangle. Block C contains a big yellow square.
What is to the left of the small black square? a big black triangle or a small yellow triangle?
big black triangle  small yellow triangle  both of them none of them