The near duplication process assigns a master document to each document family. The master document is the document most representative of the document family. A master document is usually the original document in an e-mail thread, or the document in a document family or document cluster with the earliest date.
In LAW you can compare a document with its master document or compare two related near-duplicate documents. Next to each document listed on the Near-Duplicates tab in the Duplicate Viewer dialog box is a percentage. The percentage indicates the similarity between the near-duplicate documents and the original "master" document.
1.In the main window, in the folder tree, select the file you want to compare with its master document. 2.On the Tools menu, click Duplicate Viewer. Clicking Duplicate Viewer, opens the Duplicates tab in the Duplicate Viewer dialog box.
3.Click the Near-Duplicates tab. 4.Right-click on the DocID for the document, and then click Compare to Master. 
You can also right-click on any near-duplicate document associated with the selected document, and click Compare to Master to compare the near-duplicate document to the master document.
Clicking Compare to Master opens the Near-Duplicate Viewer dialog box for the selected document and the master document.

The differences between the selected document and the master are displayed in red text, with the original value struck out and the new value is displayed in bold next to the original value.
At the top of the Near-Duplicate Viewer dialog box are navigation buttons. Between the First and Prev buttons and the Next and Last navigation buttons, the number of the current difference out of the total number of differences between the selected document and its master are displayed. The difference currently selected is highlighted in blue. You can also navigate to the previous difference using the left arrow keyboard button, and navigate to the next difference using the right arrow keyboard button.
If the documents match 100%, the navigation buttons are disabled and 0 of 0 is displayed, and the document content is not marked up in the Near-Duplicate Viewer dialog box.
The name of the files being compared is displayed in the lower-left corner of the dialog box. You can have more than one Near-Duplicate Viewer dialog boxes open at one time.

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