*SUPPORT*
IN: lug gazzer kiki OUT: PINK GREEN
IN: dax blicket OUT: RED RED
IN: dax OUT: RED
IN: lug gazzer wif OUT: BLUE GREEN
IN: lug lug OUT: GREEN GREEN
IN: lug gazzer lug OUT: GREEN GREEN
IN: wif dax OUT: BLUE RED
IN: lug blicket OUT: GREEN GREEN
IN: wif kiki lug gazzer lug OUT: BLUE PINK GREEN GREEN
IN: wif kiki gazzer kiki OUT: BLUE PINK PINK
IN: lug gazzer dax OUT: RED GREEN
IN: dax tufa OUT: RED RED RED
IN: dax gazzer dax OUT: RED RED
IN: kiki tufa OUT: PINK PINK PINK

*QUERY*
IN: kiki OUT: PINK
IN: wif blicket OUT: BLUE BLUE
IN: wif OUT: BLUE
IN: lug OUT: GREEN
IN: wif wif blicket OUT: BLUE BLUE BLUE
IN: wif tufa OUT: BLUE BLUE BLUE
IN: dax dax kiki dax dax dax tufa OUT: RED RED PINK RED RED RED RED RED
IN: lug tufa OUT: GREEN GREEN GREEN
IN: kiki gazzer lug OUT: GREEN PINK
IN: kiki blicket OUT: PINK PINK

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