static void Main(string[] args)
{
var service = new Service();
var coffeeService = new CoffeeService();
var items = service.Get();
var coffeeItems = coffeeService.Get();
//foreach (var item in items)
//{
// Console.WriteLine(item);
//}
IObservable <int> observableWater = items.ToObservable();
IObservable <int> observableCoffee = coffeeItems.ToObservable();
var observable = observableWater
.Concat(observableCoffee);
var stream2 = observable
.Where(item => item > 70);
stream2.Subscribe(item => Console.WriteLine($"sub1 {item}"));
observable
.Where(item => item < 10)
.Subscribe(item => Console.WriteLine($"sub2 {item}"));
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
}