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

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

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