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February 1981
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April 1981
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June 1981
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August 1981
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October 1981
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December 1981
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February 1982
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April 1982
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June 1982
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August 1982
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October 1982
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December 1982
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February 1983
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April 1983
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June 1983
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August 1983
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October 1983
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December 1983
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February 1984
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April 1984
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June 1984
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October 1984
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December 1984
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February 1985
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April 1985
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June 1985
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October 1985
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December 1985
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February 1986
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April 1986
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June 1986
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August 1986
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December 1986
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February 1987
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April 1987
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May 1987
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July 1987
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September 1987
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November 1987
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December 1987
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February 1988
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March 1988
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April 1988
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July 1988
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September 1988
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