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

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

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