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

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

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