Пример #1
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 def test_double_letter_middle(self):
     s = 'azza'
     self.assertTrue(double_letter(s))
Пример #2
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 def test_double_letter_end(self):
     s = 'aczz'
     self.assertTrue(double_letter(s))
Пример #3
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 def test_double_letter_beginning(self):
     s = 'aaza'
     self.assertTrue(double_letter(s))