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