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

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

*GRAMMAR*
wif -> YELLOW 
 kiki -> BLUE 
 lug -> RED 
 tufa -> GREEN 
 u1 dax u2 -> [u1] [u2] 
 u1 fep u2 -> [u2] [u2] [u1] 
 x1 gazzer x2 -> [x2] [x1] [x1] [x2] [x1] [x2] 
 u1 x1 -> [u1] [x1] 
 