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

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

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