checkBox.onclick = toggleLineWrapping;
            checkBox.checked = false;

            removeClass(label, "hidden");
         }
    }

    function switchTab() {
        var id = this.id.substr(1);

        for (var i = 0; i < tabs.tabs.length; i++) {
            if (tabs.tabs[i].id === id) {
                tabs.select(i);
                break;
            }

  ops::Switch switch_a(root.WithOpName("switch_a"), value, cond_a);
  ops::Switch switch_b(root.WithOpName("switch_b"), value, cond_b);

  Output add_a = ops::Add(root.WithOpName("add_a"), switch_a.output_true,
                          switch_b.output_true);
  Output add_b = ops::Add(root.WithOpName("add_b"), switch_a.output_true,
                          switch_b.output_true);