If there are two trains going in the same direction, none of which are red.
return trains ;return direction that #1 are going ;return #1 where  #2 is the  same ;return #3 that are red ;return #3 besides  #4 ;return number of  #5 ;return if  #6 is equal to  two
['select', 'project', 'comparative', 'filter', 'discard', 'aggregate', 'boolean']