<script>
function run() {
  setTimeout(first);
  setTimeout(second);
  setTimeout(third);
}

function first(x) {
  let y = 0;
  var z = 1;
  debugger;
}

function second(x) {
  if (second) {
    let y = 0;
    debugger;
  }
}

function third(x) {
  let y = 1;
  if (y) {
    let z = 0;
    var v = 2;
    debugger;
  }
}
</script>
