<!--
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<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function combine(arr) {
var r = [];
(function f(t, a, n) {
if (n == 0) return r.push(t);
for (var i = 0; i < a[n-1].length; i++) {
f(t.concat(a[n-1][i]), a, n - 1);
}
})([], arr, arr.length);
return r;
}
var arr = [
[1,2,3],
['a','b','c'],
['x','y','z'],
['e','f','g','h', 'i']];
var res = combine(arr);
alert(res);
</script>
</head>
<body>
<div>TODO write content</div>
</body>
</html>
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