Your best approach to this problem will be to break your text file down into single words, and add each to a tList.
You then need to iterate through the tList and check for duplicates. Every time you find a duplicate, simply remove it from the list. You could use a couple of nested For/EachIn's to do this.
If you're planning on doing this to create a usable dictionary for a word game or such, its probably a bad idea. Your bodytext might contain capitalised words such as people's names, or names of countries, or even abbreviations - all of which would not be allowed in a word game.
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