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

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

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