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

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

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