15: "terminated",
	16: "user Signal 1",
	17: "user Signal 2",
	18: "child Status Changed",
	19: "power-Fail/Restart",
	20: "window Size Change",
	21: "urgent Socket Condition",
	22: "pollable Event",
	23: "stopped (signal)",
	24: "stopped (user)",
	25: "continued",
	26: "stopped (tty input)",
	27: "stopped (tty output)",
	28: "virtual Timer Expired",
	29: "profiling Timer Expired",

	{18, "SIGCHLD", "child Status Changed"},
	{19, "SIGPWR", "power-Fail/Restart"},
	{20, "SIGWINCH", "window Size Change"},
	{21, "SIGURG", "urgent Socket Condition"},
	{22, "SIGIO", "pollable Event"},
	{23, "SIGSTOP", "stopped (signal)"},
	{24, "SIGTSTP", "stopped (user)"},
	{25, "SIGCONT", "continued"},
	{26, "SIGTTIN", "stopped (tty input)"},
	{27, "SIGTTOU", "stopped (tty output)"},

   * @throws RejectedExecutionException if the task cannot be scheduled for execution
   * @since 28.2
   */
  public static <O extends @Nullable Object> ListenableFuture<O> submit(
      Callable<O> callable, Executor executor) {
    TrustedListenableFutureTask<O> task = TrustedListenableFutureTask.create(callable);
    executor.execute(task);
    return task;
  }

  /**

   * @throws RejectedExecutionException if the task cannot be scheduled for execution
   * @since 28.2
   */
  public static <O extends @Nullable Object> ListenableFuture<O> submit(
      Callable<O> callable, Executor executor) {
    TrustedListenableFutureTask<O> task = TrustedListenableFutureTask.create(callable);
    executor.execute(task);
    return task;
  }

  /**

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.inject.Inject;
import java.io.File;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.Callable;

import static com.google.common.base.Strings.isNullOrEmpty;

  }

  static <R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      Table<R, C, V> table(Table<R, C, V> table, @CheckForNull Object mutex) {
    return new SynchronizedTable<>(table, mutex);
  }

  static final class SynchronizedTable<
          R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>

  }

  static <R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      Table<R, C, V> table(Table<R, C, V> table, @CheckForNull Object mutex) {
    return new SynchronizedTable<>(table, mutex);
  }

  static final class SynchronizedTable<
          R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>

        }
    }

    private static class PluginSpec extends AbstractStatement {
        @Nullable
        final String id;
        @Nullable
        final String version;
        @Nullable
        final String versionCatalogRef;

        PluginSpec(String id, @Nullable String version, @Nullable String comment) {
            super(comment);
            this.id = id;
            this.version = version;

   */
  public static <K extends @Nullable Object, V extends @Nullable Object> Multimap<K, V> newMultimap(
      Map<K, Collection<V>> map, final Supplier<? extends Collection<V>> factory) {
    return new CustomMultimap<>(map, factory);
  }

  private static class CustomMultimap<K extends @Nullable Object, V extends @Nullable Object>
      extends AbstractMapBasedMultimap<K, V> {

   */
  public static <K extends @Nullable Object, V extends @Nullable Object> Multimap<K, V> newMultimap(
      Map<K, Collection<V>> map, final Supplier<? extends Collection<V>> factory) {
    return new CustomMultimap<>(map, factory);
  }

  private static class CustomMultimap<K extends @Nullable Object, V extends @Nullable Object>
      extends AbstractMapBasedMultimap<K, V> {