<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def extendMarkdown(self, md, md_globals):
 """Modifies inline patterns."""

        md.inlinePatterns.add('del', SimpleTagPattern(DEL_RE, 'del'), '<not_strong')
        md.inlinePatterns.add('ins', SimpleTagPattern(INS_RE, 'ins'), '<not_strong')
        md.inlinePatterns.add('mark', SimpleTagPattern(MARK_RE, 'mark'), '<not_strong')