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

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

*GRAMMAR*
fep -> YELLOW 
 tufa -> GREEN 
 dax -> BLUE 
 kiki -> RED 
 u1 wif u2 -> [u2] [u1] 
 x1 gazzer x2 -> [x1] [x1] [x2] 
 x1 zup x2 -> [x2] [x1] [x2] [x1] [x1] [x2] [x2] 
 u1 x1 -> [u1] [x1] 
 