We have three blocks. Lets call them A, B and C. Block C is to the left of A and block A is to the left of B. Block A has a medium black square. Block B contains a medium black square. A medium blue square is touching the bottom edge of this block. This object is below the medium black square. Block C contains two medium black squares. Medium black square number one is below medium black square number two.
Which object is to the left of a medium square? the medium black square that is in block B or the medium black square that is in block A?
the medium black square  that is in block B the medium black square  that is in block A both of them none of them