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<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/2.3.22/rx.all.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
var source = Rx.Observable.range(1, 4).pairwise();
​
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + JSON.stringify(x));
    },
    function (err) {
        console.log('Error: ' + err);
    },
    function () {
        console.log('Completed');
    });
​
// => Next: [1,2]
// => Next: [2,3]
// => Next: [3,4]
// => Completed
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