');
  next();
}

function removeStart(next) {
  list.splice(0, RANGE_START);
  console.time('remove-start');
  $(document.body, ul);
  console.timeEnd('remove-start');
  next();
}

function removeMiddle(next) {
  list.splice(RANGE_START, RANGE_START);
  console.time('remove-middle');
  $(document.body, ul);
  console.timeEnd('remove-middle');
  next();
}

function removeEnd(next) {
  list.splice(RANGE_END);
  console.time('remove-end');
  $(document.body, ul);
  console.timeEnd('remove-end');
  next();
}

f