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

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

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