one anotherone another
Some usage guides proscribe "each other" for two entities and "one another" for more than two; this distinction is not observed in practice. The Oxford English Dictionary describes the pronoun as referring to "˜two or more'; Fowler's suggests that the distinction "˜is neither of present utility nor based on historical usage'. The Merriam-Webster Dictionary of English Usage notes that "˜A few commentators believe the rule to be followed in “formal discourse". This belief will not bear examination: Samuel Johnson's discourse is perhaps the most formal that exists in English literature, and he has been cited in violation of the rule.'