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

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

*GRAMMAR*
kiki -> RED 
 wif -> YELLOW 
 blicket -> GREEN 
 dax -> BLUE 
 u1 zup u2 -> [u2] [u1] 
 u1 gazzer -> [u1] [u1] 
 x1 tufa x2 -> [x2] [x1] 
 u1 x1 -> [u1] [x1] 
 