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import 'dart:math';
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const _chars =
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'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890_';
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Random _rnd = Random();
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String getRandomString(int length) => String.fromCharCodes(
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Iterable.generate(
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length,
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(_) => _chars.codeUnitAt(
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_rnd.nextInt(_chars.length),
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),
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),
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);
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