public j  static n  IEnumerable 3  OrderChars(params m  string[] b  strings)
{
 p   k   j   6  return a  strings.SelectMany(str 9  => p  str.ToCharArray())
 1   t   e   d   9   x   9   f   u   f   q  .Where(chr 6  => i  Char.IsLetter(chr)).OrderBy(chr 9  => 4  chr);
}