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BSD 4.3

#
#          D I F F E R E N T   W O R D S
#

#  This program lists all the different words in the input text.
#  The definition of a "word" is naive.

procedure main()
   letter := &lcase ++ &ucase
   words := set([])
   while text := read() do
      text ? while tab(upto(letter)) do
         insert(words,tab(many(letter)))
   every write(!sort(words))
end

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