If a group of dogs is playing outside, and at least two dogs have both front paws off the ground.
return dogs ;return group of  #1 ;return #2 that are  playing ;return If #3 are  outside ;return front paws off #1 ;return ground ;return #1 where #2 is  off #6 ;return number of #7 ;return If #8 is  at least two ;return If both  #4 and #9 are  true
['select', 'project', 'filter', 'boolean', 'project', 'select', 'comparative', 'aggregate', 'boolean', 'boolean']