*SUPPORT*
IN: kiki fep lug OUT: BLUE YELLOW YELLOW
IN: kiki OUT: BLUE
IN: lug fep lug OUT: YELLOW YELLOW YELLOW
IN: tufa fep tufa OUT: RED RED RED
IN: lug OUT: YELLOW
IN: lug tufa dax OUT: YELLOW RED GREEN
IN: lug kiki wif OUT: YELLOW BLUE BLUE
IN: dax fep kiki OUT: GREEN BLUE BLUE
IN: tufa dax fep tufa OUT: RED GREEN RED RED
IN: dax wif OUT: GREEN GREEN
IN: tufa OUT: RED
IN: tufa wif OUT: RED RED
IN: dax lug zup tufa OUT: GREEN YELLOW RED
IN: lug wif OUT: YELLOW YELLOW

*QUERY*
IN: kiki zup tufa OUT: BLUE RED
IN: tufa lug OUT: RED YELLOW
IN: dax zup kiki OUT: GREEN BLUE
IN: tufa fep dax OUT: RED GREEN GREEN
IN: lug kiki fep lug OUT: YELLOW BLUE YELLOW YELLOW
IN: kiki fep kiki OUT: BLUE BLUE BLUE
IN: dax OUT: GREEN
IN: dax wif zup lug OUT: GREEN GREEN YELLOW
IN: kiki wif OUT: BLUE BLUE
IN: tufa tufa OUT: RED RED

*GRAMMAR*
tufa -> RED 
 lug -> YELLOW 
 kiki -> BLUE 
 dax -> GREEN 
 x1 zup u1 -> [x1] [u1] 
 u1 fep u2 -> [u1] [u2] [u2] 
 u1 wif -> [u1] [u1] 
 u1 x1 -> [u1] [x1] 
 