Assertion: leap year | /r/HasProperty | the one
Facets:
Source sentences:
text: A leap year, also known as an intercalary year, is the one containing an extra day, normally February 29th, although this varies in certain calendars.
text: The obvious thing to do was to reduce some leap years —about one leap year every century.
text: Leap year is one of those things that can really blow your mind if you get to thinking about it too hard.