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| function k (c, b) { | |
| var x = c.concat() | |
| window.addEventListener('keyup', function(e) { | |
| if (x.shift() != e.keyCode) x = c.concat() | |
| if (!x.length && x.concat(c)) b() | |
| }) | |
| } | |
| k([38,38,40,40,37,39,37,39,66,65], alert.bind(null, 'hi')) |
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