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

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

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