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∗The research reported here was supported by the National Science Foundation under grant no. PFR78–04775. Any opinions, findings, and conclusions or recommendations expressed herein are those of the author and do not necessarily reflect the views of the National Science Foundation. I am grateful for the work of David Kuntz, Rene DuFort, Vickie Kendrick, and Gladys Bloedow, and for the helpful comments of Gilbert F. White, David Greenland, and Stuart W. Cook.
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