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[no subject]

    Date: 20 AUG 1980 2118-EDT
    From: Moon at MIT-AI (David A. Moon)
    m-x Keep Lines evidently doesn't use the proper deletion primitive.  From the behavior
    it would appear that it unthreads the deleted lines in the forward direction
    but not in the backward direction.
It uses DELETE-INTERVAL.  Manually rethreading at that level would be an
uncalledfor violation of modularity.  Could you give an example of how it loses?