They reason that, given one of the balls being red, the other ball by elimination must be red, black, or blue.
(the balls; being red; ) (They; reason; that, given one of the balls being red, the other ball by elimination must be red, black, or blue) Context(They reason,List([0, 11))):(the other ball by elimination; must be; red, black, or blue)
They reason,List([0, 11))
the balls They the other ball by elimination
being red reason must be
that, given one of the balls being red, the other ball by elimination must be red, black, or blue
red, black, or blue