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

*QUERY*
IN: tufa wif OUT: PINK YELLOW
IN: lug gazzer tufa OUT: GREEN PINK
IN: wif wif gazzer tufa OUT: YELLOW YELLOW PINK
IN: wif wif OUT: YELLOW YELLOW
IN: lug OUT: GREEN
IN: tufa tufa OUT: PINK PINK
IN: dax OUT: RED
IN: wif zup dax fep OUT: RED RED YELLOW RED RED YELLOW YELLOW
IN: lug gazzer wif OUT: GREEN YELLOW
IN: lug lug OUT: GREEN GREEN

*GRAMMAR*
wif -> YELLOW 
 dax -> RED 
 tufa -> PINK 
 lug -> GREEN 
 u1 fep -> [u1] [u1] 
 x1 zup x2 -> [x2] [x1] [x2] [x1] [x1] 
 u1 gazzer u2 -> [u1] [u2] 
 u1 x1 -> [u1] [x1] 
 