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Extended BNF extends ((BNF)) by operators to express the fact that there can be any number of an element. The operators are {{?}} : which means that the symbol (or group of symbols in parenthesis) to the left of the operator is optional (it can appear zero or one times) {{*}} : which means that something can be repeated any number of times (and possibly be skipped altogether) {{+}} : which means that something can appear one or more times
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