Determine if a string has all unique characters: Difference between revisions

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(Added Perl example)
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:*   [https://rosettacode.org/wiki/Determine_if_a_string_has_all_the_same_characters determine if a string has all the same characters]
:*   [https://rosettacode.org/wiki/Determine_if_a_string_has_all_the_same_characters determine if a string has all the same characters]
:*   [https://rosettacode.org/wiki/Pangram_checker pangram checker]
:*   [https://rosettacode.org/wiki/Pangram_checker pangram checker]
:*   [https://rosettacode.org/wiki/Compare_a_list_of_strings compare a list of strings]
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