Except non is not an english word, it is a prefix of latin origin Which is why american style manuals will always ask you to merge it with the subsequent word, without a hyphen Leaving non stranded doesn't work either as it is a bound morpheme, a prefix not a word (in english) I'd use the two hyphens. In that context, which is more correct or more frequently used This is for writing software documentation that explains the usage of an optional property which some objects have.
In case the answer is negative, is there any rule of thumb on which one may rely in order to recall whe.
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