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Here’s a simplified version of the sentence I'm working on.

Despite what he believed — or thought he believed — he still had to contend with the truth.

Or should I use commas?

tchrist
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1 Answers1

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There is no rule that prohibits the use of or to isolate clauses in your interrupting phrase:

A word group (a statement, question, or exclamation) that interrupts the flow of a sentence and is usually set off by commas, dashes, or parentheses.

Note: there are rules for using dashes, parentheses, and commas. See parentheses vs. double commas vs. dashes for additional details.

Third News
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