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

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

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