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

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

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