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

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

*GRAMMAR*
tufa -> RED 
 lug -> YELLOW 
 zup -> GREEN 
 dax -> BLUE 
 x1 wif u1 -> [u1] [x1] 
 x1 gazzer x2 -> [x2] [x1] [x1] [x2] 
 u1 fep u2 -> [u2] [u1] 
 u1 x1 -> [u1] [x1] 
 