private void IterateOverDictionary()
{
    Dictionary<string, HashSet<string>> claims = GetClaims();
    foreach (KeyValuePair<string, HashSet<string>> pair in claims)
    {
        string claimType = pair.Key;
        HashSet<string> claimValues = pair.Value;
        foreach (string claimValue in claimValues)
        {
            Console.WriteLine($"{claimType} = {claimValue}.");
        }
    }
}