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

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

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