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

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

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