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(function() {
	function thunkify(fn) {
		return function() {
			var args = [].slice.call(arguments);
			return function(cb) {
				args.push(cb);
				return fn.apply(null, args);
			};
		};
	}

	function foo(x, y, cb) {
		setTimeout(function() {
			cb(x + y);
		}, 1000);
	}

	var fooThunkory = thunkify(foo);
	var fooThunk1 = fooThunkory(3, 4);
	var fooThunk2 = fooThunkory(12, 12);

	fooThunk1(function(sum) {
		document.write('fooThunk1: ' + sum + '<br>')
	});

	fooThunk2(function(sum) {
		document.write('fooThunk2: ' + sum)
	});
})();