None of the given sentences contains a spelling mistake.
A spelling mistake is an error in the conventionally accepted form of spelling a word. It can also be called a typographical error. The way we spell a particular word is how we write or type that particular word down. A spelling mistake falls under the category of grammatical errors. When words are written by hands it is termed as spelling mistake while it is typed and has been published it is termed as a typo or typographical error. In all the given sentences, there is no such spelling mistake and the sentences are absolutely correct according to English grammar.
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