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

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

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