public j static n IEnumerable<char> 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);
}