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

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

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