public class SpecialFlap : Flaps
{
	private readonly List<MyFloop> FloopList;

	public SpecialFlaps()
	{
		this.FloopList = new List<MyFloop>();
	}

	public IReadonlyList<IFloop> Floops => this.FloopList.AsReadonly();

	public IReadonlyList<IFloop> Floops => this.FloopList.OfType<IFloop>().ToList().AsReadonly()
}