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

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

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