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How do I disable spell checker on words of less than four characters?

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Standard installation of spell checker throws up all manner of small words and abbreviations such as "T:" used as an abbreviation for telephone. How can I configure spell checker to disregard words of less than four letters?

Standard installation of spell checker throws up all manner of small words and abbreviations such as "T:" used as an abbreviation for telephone. How can I configure spell checker to disregard words of less than four letters?

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I am only aware of methods to turn spell checking on or off.