If all foreground buses are angled heading right and are forward-turned.
return buses ;return #1 in  the  foreground ;return #2 that are angled heading right ;return #3 that are forward-turned ;return number of  #2 ;return number of  #4 ;return if  #6 is equal to  #5
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean']