There are many considerations that go into developing a computer program which runs for months and years. Interruptions, ranging from power failures to hardware maintenance, are to be expected. A program should not have to restart from the very beginning for every interruption; otherwise, it may never finish. To solve the restarting problem, we partitioned our starting configurations into smaller cases and a message was output onto a log file every time one of them was finished. If there was an interruption, we just looked up the last completed case and continued from that point. For our programs, a convenient subdivision was at the ``A2'' boundary; more details can be found in [19,21]. The messages written on the log file also contained statistics about the run to allow comparison and verification of the results.
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