i1 : "a" .. "z"
o1 = (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x,
------------------------------------------------------------------------
y, z)
o1 : Sequence
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i2 : "aa" .. "ce"
o2 = (aa, ab, ac, ad, ae, ba, bb, bc, bd, be, ca, cb, cc, cd, ce)
o2 : Sequence
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i3 : "aaa" .. "abc"
o3 = (aaa, aab, aac, aba, abb, abc)
o3 : Sequence
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i4 : "佖" .. "佥"
o4 = (佖, 佗, 佘, 余, 佚, 佛, 作, 佝, 佞, 佟, 你, 佡, 佢, 佣,
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佤, 佥)
o4 : Sequence
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