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

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

*GRAMMAR*
wif -> GREEN 
 dax -> PURPLE 
 tufa -> RED 
 kiki -> BLUE 
 u1 fep u2 -> [u1] [u2] [u2] [u1] 
 x1 zup u1 -> [x1] [u1] 
 x1 lug x2 -> [x1] [x2] 
 u1 x1 -> [u1] [x1] 
 