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

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

*GRAMMAR*
gazzer -> YELLOW 
 fep -> BLUE 
 wif -> RED 
 dax -> GREEN 
 u1 kiki u2 -> [u1] [u2] 
 x1 tufa x2 -> [x2] [x1] 
 u1 zup u2 -> [u2] [u1] [u1] 
 u1 x1 -> [u1] [x1] 
 