We have three blocks. Lets call them A, B and C. Block A has one medium blue square and a medium yellow square. Below the medium yellow square is the medium blue square. Below block A we have block B which contains one medium blue square. Below a medium black square there is the medium blue square. Below block A there is block C which has one medium blue square.
Which object is below a medium blue square? the medium yellow square or the black object?
the medium yellow square  the black object both of them none of them