If there are four wine glasses, and some of them are in front of the others.
return wine glasses ;return number of #1 ;return if  #2 is  equal to four ;return #1 that are  in  front of  the  other wine glasses ;return number of #4 ;return if  #5 is  at least two ;return if  both  #3 and #6 are  true
['select', 'aggregate', 'boolean', 'filter', 'aggregate', 'boolean', 'boolean']