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

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

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