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

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

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