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

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

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