If exactly one of the lead dogs has both front paws off the ground.
return lead dogs ;return front paws of #1 ;return ground ;return #2 that are off #3 ;return number of  #4 for each  #1 ;return #1 where  #5 is equal to  two ;return number of  #6 ;return if  #7 is equal to  one
['select', 'project', 'select', 'filter', 'group', 'comparative', 'aggregate', 'boolean']