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

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

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