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

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

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