ICal recurrence

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YEARLY

http://tools.ietf.org/html/rfc5545 - Page 127

DTSTART;TZID=America/New_York:19970610T090000
RRULE:FREQ=YEARLY;COUNT=10;BYMONTH=6,7
...
Note: Since none of the BYDAY, BYMONTHDAY, or BYYEARDAY
      components are specified, the day is gotten from "DTSTART".

BYMONTHDAY implied.