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| 1/1988 | 2/1988 | 3/1988 | 4/1988 | 5/1988 | 6/1988 |
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| 7/1988 | 8/1988 | 9/1988 | |||
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| 1/1989 | 2/1989 | 3/1989 | 4/1989 | 5/1989 | 6/1989 |
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| 7/1989 | 8/1989 | 9/1989 | |||
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| 1/1990 | 2/1990 | 3/1990 | 4/1990 | 5/1990 | 6/1990 |
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| 7/1990 | 8/1990 | 9/1990 | |||
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| 1/1991 | 2/1991 | 3/1991 | 4/1991 | 5/1991 | 6/1991 |
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