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

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

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