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

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

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