public TextContentBuilder removingLineSuffixes(String suffixChars) {
    Set<Character> set = new HashSet<>(this.suffixChars);
    for (int i = 0; i < suffixChars.length(); i++) {
      set.add(suffixChars.charAt(i));
    }
    return new TextContentBuilder(classifier, indentChars, set);
  }
public TextContentBuilder removingLineSuffixes(String suffixChars)