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

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

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