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

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

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