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

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

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