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

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

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