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Signature files typically use Super Imposed Coding

   1. Each document is divided into logical blocks containing D distinct words (StopWords are usually removed before we make the block)
   1. Each word yields a binary "word signature" using some kind of hash code that is '''F bits in length with m bits set to 1'''. 
   1. The word signature are '''OR'd''' together to form the block signature
   1. The block signatures are concatenated together to form the document signature.

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