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By removing the associated data source (data source: A file that contains the information to be merged into a document. For example, the list of names and addresses you want to use in a mail merge. You must connect to the data source before you can use the information in it.) from a main document (main document: In a mail-merge operation in Word, the document that contains the text and graphics that are the same for each version of the merged document, for example, the return address or salutation in a form letter.), you can convert it to a regular document.