| Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993. |
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| Rs, the three |
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| is a Standard idiom, meaning reading, writing, and arithmetic. Spelled out, the expression is commonly readin, ritin, and rithmetic to stress the alliteration. | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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