*SUPPORT*
IN: dax OUT: RED
IN: zup lug OUT: BLUE BLUE
IN: fep gazzer zup OUT: GREEN BLUE
IN: dax dax kiki dax OUT: RED RED RED RED
IN: fep kiki dax OUT: GREEN GREEN RED
IN: fep gazzer dax OUT: GREEN RED
IN: tufa kiki zup OUT: PINK PINK BLUE
IN: fep kiki tufa OUT: GREEN GREEN PINK
IN: tufa lug OUT: PINK PINK
IN: fep kiki zup OUT: GREEN GREEN BLUE
IN: fep zup kiki zup OUT: GREEN BLUE BLUE BLUE
IN: tufa kiki dax OUT: PINK PINK RED
IN: tufa OUT: PINK
IN: fep zup gazzer tufa OUT: GREEN BLUE PINK

*QUERY*
IN: dax tufa OUT: RED PINK
IN: fep lug OUT: GREEN GREEN
IN: dax kiki fep OUT: RED RED GREEN
IN: dax gazzer dax OUT: RED RED
IN: zup fep kiki zup OUT: BLUE GREEN GREEN BLUE
IN: zup kiki zup OUT: BLUE BLUE BLUE
IN: zup gazzer tufa OUT: BLUE PINK
IN: fep OUT: GREEN
IN: dax fep kiki dax OUT: RED GREEN GREEN RED
IN: dax kiki zup OUT: RED RED BLUE

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