If at least one of the dogs is being handled by a human; either by leash or by grip.
return dogs ;return human ;return leash ;return #1 being handled by  #3 ;return #1 being handled by  grip of #2 ;return #4 , #5 ;return number of  #6 ;return if  #7 is at least one
['select', 'select', 'select', 'filter', 'filter', 'union', 'aggregate', 'boolean']