If all trains have a reddish front, and no image shows the front of more than one train.
return trains ;return front  of #1 ;return #1 where  #2 is reddish ;return number of  #1 ;return number of  #3 ;return if  #4 is equal to  #5 ;return images ;return number of  #2 for each  #7 ;return #7 where  #8 is higher than one ;return number of  #9 ;return if  #10 is equal to  zero ;return if  both  #6 and #11 are true
['select', 'project', 'comparative', 'aggregate', 'aggregate', 'boolean', 'select', 'group', 'comparative', 'aggregate', 'boolean', 'boolean']