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One can't think aloud.

It's illogical to use one word when another is more concise and succinct like talking and speaking in this case.

Some words are self-explanatory like thinking.

The post you're replying to didn't say that, but regardless, I would say 'thinking aloud' is a pretty good descriptor for the word-by-word narration kind of thinking where you sort of both say and hear it in your head. I have heard that some people who who experience 'inner monologue' experience their thoughts nearly exclusively like this.

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