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

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

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