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

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

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