*SUPPORT*
IN: dax dax tufa OUT: YELLOW YELLOW YELLOW YELLOW
IN: dax dax OUT: YELLOW YELLOW
IN: wif dax dax wif gazzer wif OUT: PINK YELLOW YELLOW PINK PINK
IN: dax fep kiki OUT: BLUE YELLOW YELLOW YELLOW
IN: lug kiki OUT: GREEN BLUE
IN: wif dax OUT: PINK YELLOW
IN: kiki fep lug OUT: GREEN BLUE BLUE BLUE
IN: dax tufa OUT: YELLOW YELLOW
IN: kiki OUT: BLUE
IN: lug OUT: GREEN
IN: wif OUT: PINK
IN: dax kiki OUT: YELLOW BLUE
IN: dax gazzer wif gazzer kiki tufa OUT: YELLOW PINK BLUE YELLOW PINK BLUE
IN: wif gazzer wif tufa tufa OUT: PINK PINK PINK PINK PINK PINK PINK PINK

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

*GRAMMAR*
dax -> YELLOW 
 wif -> PINK 
 lug -> GREEN 
 kiki -> BLUE 
 x1 tufa -> [x1] [x1] 
 x1 gazzer x2 -> [x1] [x2] 
 x1 fep x2 -> [x2] [x1] [x1] [x1] 
 u1 x1 -> [u1] [x1] 
 