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

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

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