*SUPPORT*
IN: wif fep wif OUT: RED RED
IN: dax tufa OUT: BLUE BLUE
IN: wif tufa OUT: RED RED
IN: lug tufa OUT: PURPLE PURPLE
IN: gazzer wif lug tufa OUT: GREEN RED PURPLE PURPLE
IN: dax zup OUT: BLUE BLUE
IN: lug OUT: PURPLE
IN: wif zup fep gazzer OUT: RED RED GREEN
IN: wif wif OUT: RED RED
IN: dax zup fep dax OUT: BLUE BLUE BLUE
IN: gazzer tufa OUT: GREEN GREEN
IN: gazzer gazzer fep lug OUT: GREEN GREEN PURPLE
IN: gazzer fep lug OUT: GREEN PURPLE
IN: gazzer lug zup OUT: GREEN PURPLE PURPLE

*QUERY*
IN: wif OUT: RED
IN: lug fep dax fep wif OUT: PURPLE BLUE RED
IN: wif gazzer OUT: RED GREEN
IN: dax dax fep lug OUT: BLUE BLUE PURPLE
IN: lug tufa fep wif OUT: PURPLE PURPLE RED
IN: gazzer zup OUT: GREEN GREEN
IN: lug zup OUT: PURPLE PURPLE
IN: lug wif zup OUT: PURPLE RED RED
IN: wif zup fep wif OUT: RED RED RED
IN: wif zup OUT: RED RED

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