There are two blocks. We call them A and B. Block A contains a medium black square. Below block A is block B which contains three medium yellow squares. Below a medium black square and medium yellow square number two there is medium yellow square number one. Medium yellow square number two is below the medium black square and medium yellow square number three. Medium yellow square number three is below the medium black square.
Which object is below a medium black square? medium yellow square number one or medium yellow square number three?
medium yellow square  number one medium yellow square  number three both of them none of them