| Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993. |
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| thru (adv., adj., prep.) |
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| is a variant spelling of through, widely written but relatively seldom printed; it was formally proposed by spelling reformers in the late nineteenth century as a simplification, and like tho has rarely been questioned seriously in Informal use. See SPELLING (1). | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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