3 - EBNF to BNF (15 points) The following EBNF grammar defines a language of signed decimal numbers. In this notation, inline alternatives can be delimited by parentheses and separated by vertical bars, optional elements are in square brackets and a sequence in curly braces can be repeated any number of times or, if immediately followed by asymbol, one or more times. D->0| 1|2 |3 |4|5 | 6|7|8|9 Give a regular BNF grammar for this language, i.e., one that does not use the extra notation for inline alternatives, optional elements, or repetitions