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| Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993. |
| PLURALS OF LETTERS AND NUMBERS |
| usually add -s: two Xs, Ph.D.s, MIAs, 1990s, the ’20s. Use an apostrophe only when you need it to prevent confusion: Mississippi has four i’s. He got A’s in both courses. | 1 |
| The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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