Details
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    Bug 
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    Resolution: Unresolved
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    Major 
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    None
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    2.4.1
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    None
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        Unknown
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Description
Any complex recurrence relations, such as `RRULE:FREQ=MONTHLY;INTERVAL=2;BYDAY=-1TH` (every 2 months on the last Thursday), are broken when imported, as they are mapped to only be monthly.
As far as I can tell, the cause is this.] Maybe using the ical4j recurrence relations somehow to not have to reimplement event generators?