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

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

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