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

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

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