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

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

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