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

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

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