There are two blocks. We call them A and B. Block A is to the left of B. Block A contains two medium black squares and two other medium yellow squares. Medium black square number one is touching the bottom edge of this block. Medium black square number two is below medium yellow square number two. Medium yellow square number one is below medium yellow square number two. Below medium yellow square number two , medium yellow square number one and medium black square number two is medium black square number one. Block B contains one medium black square.
Which object is to the left of a medium black square? medium yellow square number one or medium yellow square number two?
medium yellow square  number one medium yellow square  number two both of them none of them