Which one of the following is a correctly spelled word?
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For difficult spellings, remember common letter patterns and double consonants (e.g., vicissitude has double \textit{s} and the pattern \textit{ssit}).
Concept:
The word \textit{vicissitude} refers to a change of circumstances, typically sudden or unexpected. It is commonly used in literature and formal writing.
Explanation:
The correct spelling contains double \textit{s} and the sequence \textit{ssit}. The other options either add extra letters or omit necessary consonants, making them incorrect spellings.