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

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

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