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 * ̕R[h UTF-8 ɂ܂B
   * \[Xt@C̕R[hw {{{"-*- coding: xxxx -*-"}}}B
   * t@CI[v֐ open ɕR[hẅǉ:
     {{{open(filename, mode, encoding)}}}B
     ̗ test/test-string.az QƂB
   * sqlite3 W[œ{ꂪg悤ɂȂ܂B
   * 𕶎Pʂň悤ɏC
{{{
>>> "".len()
5
>>> ""[0]
""
>>> "".right(2)
""
}}}
 * 񂨂ёgݍ킹̌Ԃ List#permutation(), List#combination() ǉ
{{{
>>> [1, 2, 3].permutation():list
[[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]]
>>> [1, 2, 3].combination(2):list
[[1, 2], [1, 3], [2, 3]]
}}}
