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If ...TimeSlice.validTime.TimePeriod.endPosition is NIL and ...TimeSlice.validTime.TimePeriod.endPosition@indeterminatePosition has the value "unknown" (the area is permanent), then insert "PERM" as item C value.

Otherwise, if ...TimeSlice.validTime.TimePeriod.endPosition is not NIL, then insert its value in item C formatted according to the NOTAM syntax for this field: yymmddhhmm. If the time value of endPosition is 24:00 or 24:00:00, then the value “2359” shall be used as hhmm group in item C. In addition, if ...TimeSlice.validTime.TimePeriod.endPosition@indeterminatePosition has the value "unknown", "before" or "after" (the Event has an estimated end of validity), then append "EST" at the end of the item C value.

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