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

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

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