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

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

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