*SUPPORT*
IN: dax OUT: BLUE
IN: fep tufa dax OUT: RED BLUE
IN: gazzer gazzer tufa fep OUT: YELLOW YELLOW RED
IN: gazzer OUT: YELLOW
IN: dax blicket kiki OUT: PURPLE BLUE
IN: fep OUT: RED
IN: kiki tufa kiki OUT: PURPLE PURPLE
IN: dax tufa fep OUT: BLUE RED
IN: gazzer blicket kiki OUT: PURPLE YELLOW
IN: gazzer tufa kiki OUT: YELLOW PURPLE
IN: kiki blicket fep OUT: RED PURPLE
IN: dax blicket gazzer OUT: YELLOW BLUE
IN: kiki kiki tufa fep OUT: PURPLE PURPLE RED
IN: fep lug kiki OUT: PURPLE RED

*QUERY*
IN: dax tufa dax OUT: BLUE BLUE
IN: dax tufa kiki OUT: BLUE PURPLE
IN: dax lug kiki OUT: PURPLE BLUE
IN: kiki tufa dax OUT: PURPLE BLUE
IN: kiki kiki kiki lug gazzer OUT: PURPLE PURPLE YELLOW PURPLE
IN: fep lug fep OUT: RED RED
IN: kiki lug dax OUT: BLUE PURPLE
IN: fep lug gazzer OUT: YELLOW RED
IN: gazzer tufa fep OUT: YELLOW RED
IN: fep tufa gazzer OUT: RED YELLOW

*GRAMMAR*
dax -> BLUE 
 kiki -> PURPLE 
 gazzer -> YELLOW 
 fep -> RED 
 u1 tufa u2 -> [u1] [u2] 
 u1 blicket u2 -> [u2] [u1] 
 u1 lug u2 -> [u2] [u1] 
 u1 x1 -> [u1] [x1] 
 