０～１３など、数列がほしいときに
いちいち書くのは面倒くさい。
ループにするのも、大げさな。
Rangeを配列に変換する って手があった。
[*0..13] # => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
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