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

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

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