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

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

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