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

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

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