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

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

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