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    Well, the tests are outrageously bad, so...

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    Oh my, it's really not a good solution... looks clever, but it isn't (in multiple ways)

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    This comment is hidden because it contains spoiler information about the solution

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    You're right. Now I think that this is not a good solution in any case.

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    This will not work if the string contains an even number of duplicates of a word, or a word that is a reverse of another word in the string. Consider the input stressed desserts.

    In the first iteration of the for loop, all instances of stressed will be replaced with desserts, leaving str equal to desserts desserts.

    In the second iteration, all instances of desserts will be replaced with stressed, including the desserts introduced by the first iteration's replacement.

    This gives the incorrect output stressed stressed.

    If a word is repeated an even number of times, this solution will also reverse the reversal for that word.