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DATE_EXACT
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The date is known and exact
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DATE_APPROXIMATE_ABOUT
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The event occurred at about this date
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DATE_APPROXIMATE_AFTER
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The event occurred after this date
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DATE_APPROXIMATE_BEFORE
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The event occurred before this date
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DATE_APPROXIMATE_CALC
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The date is calculated
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DATE_APPROXIMATE_EST
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The date is estimated
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DATE_RANGE_BETWEEN
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The event between two dates
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DATE_RANGE_FROM |
The event from one date to another
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DATE_RANGE_AND
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The event occurred at two dates
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DATE_RANGE_TO
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The event up to a date
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