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

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

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