code: function removeCharacters(regen, set) {
      // Remove characters provided
      for (var i in set) {
        for (var j in set[i].chars) {
          // There should always be a 0th-index element
          if (set[i].chars[j][0] === undefined) {
            continue;
          }
  
          // Remove the character range, or a single character itself, from the set
          if (set[i].chars[j][1] !== undefined) {
            regen.removeRange(set[i].chars[j][0], set[i].chars[j][1]);
          } else {
            regen.remove(set[i].chars[j][0]);
          }
        }
      }
  
      return regen;
    }
docs: Removes the given character/range from the set
  
  @param {Regenerate} regen An instance of the Regenerate object
  @param {Array} set An Array containing a 0th and (optionally) a 1st index
  representing a character or character range
  @returns {Regenerate} An updated instance of the Regenerate object