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

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

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