If at least one half of the dogs have their mouths open.
return dogs ;return mouth of #1 ;return #1 where  #2 is open ;return #1 besides  #3 ;return number of  #3 ;return number of  #4 ;return the  division of #5 and #6 ;return if  #7 is at least one
['select', 'project', 'comparative', 'discard', 'aggregate', 'aggregate', 'arithmetic', 'boolean']