There are three blocks. We call them A, B and C. Block A is below block B and above block C. Block A contains two medium yellow squares and two other medium black squares. Below medium yellow square number two and medium black square number two there is medium yellow square number one. Below medium black square number two is medium yellow square number two. Medium black square number one is below medium yellow square number two. It is below medium black square number two. Block B contains two medium blue squares. Medium blue square number one is below medium blue square number two. And block C contains one medium yellow square.
Which object is below a medium blue square? medium black square number two or medium black square number one?
medium black square  number two medium black square  number one both of them none of them