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<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-2.1.0.min.js"></script>
  <title>JS Bin</title>
  <script src="//cdn.jsdelivr.net/rsvp/3.0.6/rsvp.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/rxjs/2.2.28/rx.all.min.js"></script>
</head>
<body>
  <input id="input" type="text">
</body>
</html>
 
var source = Rx.Observable.range(0, 3)
    .map(function (x) { return Rx.Observable.range(x, 3); })
    .concatAll();
​
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x);
    },
    function (err) {
        console.log('Error: ' + err);   
    },
    function () {
        console.log('Completed');   
    });
​
// => Next: 0 
// => Next: 1 
// => Next: 2 
// => Next: 1 
// => Next: 2 
// => Next: 3 
// => Next: 2 
// => Next: 3 
// => Next: 4 
// => Completed
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