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

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

*GRAMMAR*
wif -> BLUE 
 dax -> RED 
 gazzer -> YELLOW 
 lug -> GREEN 
 u1 zup u2 -> [u1] [u2] 
 u1 blicket -> [u1] [u1] 
 u1 tufa -> [u1] [u1] [u1] 
 u1 x1 -> [u1] [x1] 
 