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

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

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