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

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

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