Is the thing hiding behind the block the same size as the thing behind and to the left of the block?
return block ;return which  thing Is hiding behind #1 ;return which  thing Is behind the    #1 ;return #3 that  Is to there  left of #1 ;return if  #2 Is the    same size as #4
['select', 'project', 'project', 'filter', 'boolean']