[Cs4800] no typo

[Karl Lieberherr]

The problem 4.30 in the text book is actually correctly stated without
typos.
I was under the assumption that Z defines the set of "extra" nodes.
But in the text book, the extra nodes are Z-X (set difference) where X are
the terminals.

So everything is fine as stated, no typo to look for.

-- Karl
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