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GMAT Grammar: each other vs. one another

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I learned from some grammar textbooks that it was redundant to use ''etc.'' in conjunction with ''such as,'' ''including,'' ''for example,'' ''e.g.,'' or ''like'' in a sentence. But I noticed ''etc.'' is

GMAT Sentence Correction with 20 Practice Questions and Answers - Magoosh Blog — GMAT® Exam