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

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

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