Determine if a string is collapsible: Difference between revisions

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:*   [https://rosettacode.org/wiki/Determine_if_a_string_has_all_unique_characters determine if a string has all unique 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/Determine_if_a_string_is_squeezable determine if a string is squeezable].
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