The Canadian Style
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- - Close Hyphenation: Compounding and Word Division
- Introduction to Hyphenation: Compounding and Word Division
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2.15 Numerals and single letters
Hyphenate numerals or single letters and the words they modify:
- S-hook
- T-shirt
- U-turn
- 1,2-dimethylbutylene
- 2,4-D
Do not hyphenate a compound adjective when the second element is a letter or figure:
- Class II railroad
- Grade A milk
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