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

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

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