public (int, string) GetNextSequence()
{
var random = new Random();
var newList = SequenceList.Where(x => !UsedSequences.Contains(x));
var rnd = random.Next(0, newList.Count());
var result = newList.ToList()[rnd];
UsedSequences.Add(result);
return(UsedSequences.Count - 1, result);
}