Assertion: calendar's month | /r/HasProperty | based in traditional hindu calendars
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Source sentences:
text: Indian national calendar solar Gregorian-derived 1957 Republic of India Gregorian calendar with months based in traditional Hindu calendars and numbering years based on the Saka era (AD 78).
text: Nanakshahi calendar solar Gregorian-derived 1998 Sikhism Gregorian calendar with months based in traditional Hindu calendars and numbering years based on the era 1469.