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

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

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