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

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

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