(function() {
    var a = Symbol(), b = Symbol(), c = Symbol(), d = Symbol(), e = Symbol(), f = Symbol(), g = Symbol(), h = Symbol(), i = Symbol(), j = Symbol(), k = Symbol();
    var o = {[a]:1, [b]:2, [c]:3, [d]:4, [e]:5, [f]:6, [g]:7, [h]:8, [i]:9, [j]:10, [k]:11};
    var result = 0;
    for (var index = 0; index < 1000000; ++index)
        result += o[a] ^ o[b] | o[c] ^ o[d] & o[e] ^ o[f] | o[g] ^ o[h] & o[i] ^ o[j] | o[k];
    if (result != 15000000)
        throw "Error: bad result: " + result;
})();