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

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

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