*SUPPORT*
IN: wif wif OUT: PINK PINK
IN: lug lug OUT: RED RED
IN: kiki fep lug tufa lug OUT: RED RED RED BLUE
IN: lug kiki tufa wif OUT: PINK RED BLUE
IN: dax tufa dax tufa dax gazzer OUT: PURPLE PURPLE PURPLE PURPLE PURPLE PURPLE
IN: wif tufa wif gazzer OUT: PINK PINK PINK PINK
IN: wif fep lug OUT: RED RED PINK
IN: wif lug tufa kiki gazzer OUT: BLUE PINK RED BLUE PINK RED
IN: wif kiki gazzer OUT: PINK BLUE PINK BLUE
IN: kiki fep wif OUT: PINK PINK BLUE
IN: lug fep wif gazzer tufa wif OUT: PINK PINK PINK RED PINK PINK RED
IN: kiki OUT: BLUE
IN: kiki fep lug gazzer OUT: RED RED BLUE RED RED BLUE
IN: kiki fep kiki OUT: BLUE BLUE BLUE

*QUERY*
IN: kiki lug OUT: BLUE RED
IN: wif fep dax OUT: PURPLE PURPLE PINK
IN: lug OUT: RED
IN: dax fep lug tufa wif OUT: PINK RED RED PURPLE
IN: lug lug kiki gazzer OUT: RED RED BLUE RED RED BLUE
IN: kiki lug fep wif OUT: BLUE PINK PINK RED
IN: kiki wif tufa dax OUT: PURPLE BLUE PINK
IN: lug fep dax gazzer OUT: PURPLE PURPLE RED PURPLE PURPLE RED
IN: kiki wif tufa dax tufa lug tufa dax OUT: PURPLE RED PURPLE BLUE PINK
IN: wif fep wif OUT: PINK PINK PINK

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