There are thirteen types of Kitsune in Japanese mythology.
Tengoku (Heaven, Celestial, Light, Prime)
Kukan (Void or Dark)
Kaze (Wind)
Seishin (Spirit)
Kasai (Fire)
Chikyu (Earth)
Kawa (River)
Umi (Ocean, Sea)
Yama (Mountain)
Mori (Forest, Woods)
Sanda (Thunder)
Jikan (Time)
Ongaku (Music, Sound)
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You can have infinitely many mathematical expressions that equal 13. Or any other given number. For example, 13 + 0, 12 + 1, 11 + 2, etc., then 0 + 13, - 1 + 14, -2 + 15, etc. ... there you have infinitely many. You can make up lots of other types of expressions that give the same result.
13 - (-13) = 13 + 13 = 26
13 - 13 = 0
91
13 x 13 x 13 is equal to 2,197