There are two blocks, A and B. Block A has a medium blue triangle, a big black triangle and one medium yellow square. To the right of the medium yellow square and the big black triangle is the medium blue triangle. The medium yellow square is touching the bottom edge of this block. Above the medium yellow square is the big black triangle. Block B is to the left of block A. It contains one big blue circle. There is also one big black square touching the bottom edge of this block. One medium yellow triangle is also in this block. The big blue circle is below, to the right of and touching the medium yellow triangle. Below and to the right of the medium yellow triangle is the big black square.
What is to the left of the medium yellow square? a medium blue triangle or a big black square?
medium blue triangle  big black square  both of them none of them