9/4/2017 · Medical Heritage Library (IA 101153881.nlm.nih.gov).pdf 633 × 1,039, 454 pages; 32.13 MB 11استقلال احمد حیدرخان.jpg 750 × 525; 117 KB 12 con giáp Mèo.png 500 × 500; 18 KB13 (thirteen) is the natural number following 12 and preceding 14.. Strikingly folkloric aspects of the number 13 have been noted in various cultures around the world one theory is that this is due to the cultures employing lunarsolar calendars (there are approximately 12.41 lunations per solar year, and hence 12 true months plus a smaller, and often portentous, thirteenth month).
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