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

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

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