If there is at least one dog lying on its front or back.
return dogs ;return front of #1 ;return back of #1 ;return #1 lying on #2 ;return #1 lying on #3 ;return #4 , #5 ;return number of  #6 ;return if  #7 is at least one
['select', 'project', 'project', 'filter', 'filter', 'union', 'aggregate', 'boolean']