There are various aspects regarding the issue of spelling. One area of difficulty is when to use apostrophes and capitals. There are other situations where words are pronounced in the same way (homonyms) but are spelled differently and have different meanings such as compliment and complement. Closely related is the problem of commonly confused words such as effect and affect.
How to spell the plural form of nouns can also be a problem. Whether to use the numeral form or to spell out numbers is another problem area. Lastly, when and how to abbreviate is a spelling topic..
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