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

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

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