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

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

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