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

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

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