A block called AAA have a small yellow square, a small blue square and a big black circle. North of the big black circle there is the blue object. Block AAA covers a medium yellow square. A small black circle is in this block. South of, disconnected from and east of this block is another block called BBB with a big yellow square. Block AAA is close to this block. In another block named CCC there is this block.
Where is the small yellow square relative to block BBB?