private static Map<String, Long> withAllRemoved(Map<String, Long> from, Map<String, Long> toRemove) {
    Map<String, Long> result = new LinkedHashMap<>(from);
    for (String each : toRemove.keySet()) {
      result.remove(each);
    }
    return result;
  }
private static Map<String, Long> withAllRemoved(Map<String, Long> from, Map<String, Long> toRemove)