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non-terminal string Edit

I'm not sure if I post this question in the right section, so please stay cool when I made a mistake. I want to ask if I can use more than one single character as a non-terminal symbol at the grammar section of the program. So e.g. (F -> NUM; and NUM -> 0...).

I would really appreciate a fast answer.

Thanks, a undergraduate

PS: Sorry for my bad Englisch, it isn't my first language.

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