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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _lex_fortran(self, match, ctx=None):
 """Lex a line just as free form fortran without line break."""

        lexer = FortranLexer()
        text = match.group(0) + "\n"
        for index, token, value in lexer.get_tokens_unprocessed(text):
            value = value.replace('\n', '')
            if value != '':
                yield index, token, value