There are three blocks, called AAA, BBB and CCC. Block AAA have a big blue triangle, a big blue square and a small yellow square. This block covers a small yellow circle. In front of the small yellow square is the big blue square. Another big blue triangle is inside block AAA. Big blue triangle number two is south of the big blue square. Block AAA is inside and touching block BBB. Block BBB covers a big blue triangle. Disconnected from and in front of this block is block CCC with a big blue triangle.
Is a yellow square behind all objects?