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

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

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