If there is a pair of dogs that are sitting in the grass together and another pair that is not.
return pair of dogs ;return grass ;return #1 that are sitting together ;return #3 that are in  #2 ;return #1 besides  #4 ;return number of  #4 ;return if  #6 is at least one ;return number of  #5 ;return if  #8 is at least one ;return if  both  #7 and #9 are true
['select', 'select', 'filter', 'filter', 'discard', 'aggregate', 'boolean', 'aggregate', 'boolean', 'boolean']