*SUPPORT*
IN: dax fep OUT: RED RED RED
IN: wif fep OUT: YELLOW YELLOW YELLOW
IN: tufa dax fep OUT: GREEN RED RED RED
IN: wif wif fep kiki dax OUT: YELLOW YELLOW YELLOW YELLOW RED
IN: wif OUT: YELLOW
IN: tufa wif fep OUT: GREEN YELLOW YELLOW YELLOW
IN: dax fep kiki wif OUT: RED RED RED YELLOW
IN: gazzer OUT: PURPLE
IN: gazzer tufa fep OUT: PURPLE GREEN GREEN GREEN
IN: dax OUT: RED
IN: tufa fep OUT: GREEN GREEN GREEN
IN: gazzer lug wif fep OUT: PURPLE YELLOW YELLOW YELLOW
IN: gazzer kiki tufa OUT: PURPLE GREEN
IN: dax gazzer fep lug dax gazzer OUT: RED PURPLE PURPLE PURPLE RED PURPLE

*QUERY*
IN: gazzer tufa kiki tufa kiki tufa OUT: PURPLE GREEN GREEN GREEN
IN: gazzer fep OUT: PURPLE PURPLE PURPLE
IN: wif lug dax fep OUT: YELLOW RED RED RED
IN: gazzer gazzer kiki wif OUT: PURPLE PURPLE YELLOW
IN: wif dax fep OUT: YELLOW RED RED RED
IN: wif wif fep lug dax fep kiki gazzer OUT: YELLOW YELLOW YELLOW YELLOW RED RED RED PURPLE
IN: wif kiki tufa OUT: YELLOW GREEN
IN: gazzer gazzer fep OUT: PURPLE PURPLE PURPLE PURPLE
IN: tufa OUT: GREEN
IN: tufa fep lug wif OUT: GREEN GREEN GREEN YELLOW

*GRAMMAR*
dax -> RED 
 wif -> YELLOW 
 gazzer -> PURPLE 
 tufa -> GREEN 
 x1 kiki u1 -> [x1] [u1] 
 x1 lug x2 -> [x1] [x2] 
 u1 fep -> [u1] [u1] [u1] 
 u1 x1 -> [u1] [x1] 
 