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

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

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