Use "each other" when referring to two people or things, and use "one another" when referring to more than two people or things.
No, "each other" and "one another" cannot be used interchangeably. They have slightly different meanings and should be used in the appropriate context.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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