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This will ensure all copies of the patches get put in the same email thread, rather than having different versions spread throughout the reader's mailbox. 2) Please include in the cover letter a short one/two-line description of what has changed in each version, so anyone reviewing e.g. v4 after reading v3, is aware of what parts of v4 they need to look at specifically. Generally, this should be in reverse order e.g. v4: renamed bar to foobar v3: changed foo to bar v2: added new foo Thanks, /Bruce