https://en.m.wikipedia.org/wiki/Production_(computer_science)
Well Wikipedia pretty much gives the answer. Can you possibly clarify your question?
I don't understand it
I bet concrete examples are much more understandable. Say you have two productions: A -> a B a B -> b b and an input string A A You apply productions: A A => a B a A => a b b a A => a b b a a B a => a b b a a b b a Now you're done.
S = T S = S + T Both are productions
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