Assertion: calendar's month | /r/CapableOf | alternate combinations of 29 and 30 days
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Source sentences:
text: Early people could either try to stay in sync with the moon, perhaps making months alternating combinations of 29 and 30 days, with special rules to resync occasionally with a solar year by adding leap months (such as the Jewish or Chinese calendar) or abandon lunar cycles and concentrate on the solar year (such as the Ancient Egyptian calendar of 12 same-sized months).