def _norm(self, string):
nstring = norm(string)<EOL>if "<STR_LIT:/>" in string:<EOL><INDENT>s, t = string.split('<STR_LIT:/>')<EOL>nstring = t<EOL><DEDENT>return self.normalize(nstring)<EOL>
Extended normalization: normalize by list of norm-characers, split
        by character "/".