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

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

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