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<script>
function start() {
var weak1 = { a: 2 }, weak2 = { a: 5 };
var set = new Set([{a: 1}]);
var weakset = new WeakSet([weak1]);
var map = new Map([[{a: 3},{a:4}]]);
var weakmap = new WeakMap([[weak2,{a:6}]]);
debugger;
}
</script>