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

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

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