htoma

public static List<string> Anagrams()
{
    var star = string.Join("", "star".OrderBy(l => l));
    return "parts,traps,arts,rats,starts,tarts,rat,art,tar,tars,stars,stray"
        .Split(',')
        .Where(w => w.Length == star.Length && string.Join("", w.OrderBy(l => l)).Contains(star)).ToList();
}