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

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

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