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

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

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