code: def replace_rep(t:str) -> str:
      "Replace repetitions at the character level in `t`."
      def _replace_rep(m:Collection[str]) -> str:
          c,cc = m.groups()
          return f' {TK_REP} {len(cc)+1} {c} '
      re_rep = re.compile(r'(\S)(\1{3,})')
      return re_rep.sub(_replace_rep, tf replace_rep(t:str) -> str:
      "Replace repetitions at the character level in `t`."
      def _replace_rep(m:Collection[str]) -> str:
          c,cc = m.groups()
          return f' {TK_REP} {len(cc)+1} {c} '
      re_rep = re.compile(r'(\S)(\1{3,})')
      return re_rep.sub(_replace_rep, t)
docs: Replace repetitions at the character level in `t`.