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"The difference
between the artificial combinatorial system we see in word-chain devices
and the natural one is summed up in a line from the Joyce Kilmer poem :
"Only God can make a tree." A sentence is not a chain but a tree. In a
human grammar, words are grouped into phrases, like twigs in a branch.
The phrase is given a name - a mental symbol - and little phrases can be
joined into bigger ones."
Steven Pinker, The
Language Instinct
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