*SUPPORT*
IN: wif wif dax gazzer fep dax OUT: RED RED PINK PINK GREEN
IN: wif dax fep gazzer OUT: RED GREEN PINK
IN: zup fep zup OUT: BLUE BLUE
IN: zup fep gazzer OUT: GREEN BLUE
IN: wif fep wif OUT: RED RED
IN: zup gazzer fep gazzer OUT: BLUE GREEN GREEN
IN: zup OUT: BLUE
IN: wif lug OUT: RED RED RED RED
IN: dax fep zup OUT: BLUE PINK
IN: dax fep wif OUT: RED PINK
IN: zup lug OUT: BLUE BLUE BLUE BLUE
IN: gazzer OUT: GREEN
IN: zup dax lug OUT: BLUE PINK PINK PINK PINK
IN: gazzer lug OUT: GREEN GREEN GREEN GREEN

*QUERY*
IN: gazzer fep wif OUT: RED GREEN
IN: wif wif lug OUT: RED RED RED RED RED
IN: dax OUT: PINK
IN: dax fep dax tufa OUT: PINK PINK PINK PINK PINK PINK
IN: zup zup fep dax OUT: BLUE PINK BLUE
IN: zup wif lug OUT: BLUE RED RED RED RED
IN: dax lug OUT: PINK PINK PINK PINK
IN: zup fep dax OUT: PINK BLUE
IN: wif OUT: RED
IN: wif wif tufa OUT: RED RED RED RED RED RED

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