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

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

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