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

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

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