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

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

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