*SUPPORT*
IN: wif fep dax OUT: BLUE PURPLE BLUE
IN: wif OUT: PURPLE
IN: zup lug OUT: RED RED RED
IN: dax fep dax OUT: BLUE BLUE BLUE
IN: wif lug OUT: PURPLE PURPLE PURPLE
IN: kiki fep kiki OUT: GREEN GREEN GREEN
IN: zup fep dax OUT: BLUE RED BLUE
IN: dax kiki OUT: BLUE GREEN
IN: wif fep zup OUT: RED PURPLE RED
IN: dax fep wif OUT: PURPLE BLUE PURPLE
IN: zup fep kiki OUT: GREEN RED GREEN
IN: kiki zup lug OUT: GREEN RED RED RED
IN: dax lug OUT: BLUE BLUE BLUE
IN: dax gazzer OUT: BLUE BLUE BLUE

*QUERY*
IN: dax fep zup OUT: RED BLUE RED
IN: zup OUT: RED
IN: kiki fep zup OUT: RED GREEN RED
IN: kiki lug OUT: GREEN GREEN GREEN
IN: kiki wif lug OUT: GREEN PURPLE PURPLE PURPLE
IN: zup zup wif lug OUT: RED RED PURPLE PURPLE PURPLE
IN: zup kiki gazzer OUT: RED GREEN RED GREEN RED GREEN
IN: dax dax lug OUT: BLUE BLUE BLUE BLUE
IN: kiki fep dax OUT: BLUE GREEN BLUE
IN: kiki OUT: GREEN

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