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

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

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