*/
  public static <
          V1 extends @Nullable Object, V2 extends @Nullable Object, V3 extends @Nullable Object>
      Combiner3<V1, V2, V3> whenAllSucceed(
          ClosingFuture<V1> future1, ClosingFuture<V2> future2, ClosingFuture<V3> future3) {
    return new Combiner3<>(future1, future2, future3);
  }

  /**
   * Starts specifying how to combine four {@link ClosingFuture}s into a single pipeline, assuming

   */
  public static <
          V1 extends @Nullable Object, V2 extends @Nullable Object, V3 extends @Nullable Object>
      Combiner3<V1, V2, V3> whenAllSucceed(
          ClosingFuture<V1> future1, ClosingFuture<V2> future2, ClosingFuture<V3> future3) {
    return new Combiner3<>(future1, future2, future3);
  }

  /**
   * Starts specifying how to combine four {@link ClosingFuture}s into a single pipeline, assuming

import com.google.common.util.concurrent.ClosingFuture.Combiner;
import com.google.common.util.concurrent.ClosingFuture.Combiner.AsyncCombiningCallable;
import com.google.common.util.concurrent.ClosingFuture.Combiner.CombiningCallable;
import com.google.common.util.concurrent.ClosingFuture.Combiner2.AsyncClosingFunction2;
import com.google.common.util.concurrent.ClosingFuture.Combiner2.ClosingFunction2;

        Callable<C> combiner, Executor executor) {
      return new CombinedFuture<>(futures, allMustSucceed, executor, combiner);
    }

    /**
     * Creates the {@link ListenableFuture} which will return the result of running {@code combiner}
     * when all Futures complete. {@code combiner} will run using {@code executor}.
     *

        A accum = collector.supplier().get();
        for (T input : inputs) {
          A newAccum = collector.supplier().get();
          collector.accumulator().accept(newAccum, input);
          accum = collector.combiner().apply(accum, newAccum);
        }
        return accum;
      }
    },
    /** Get one accumulator for each element and merge the accumulators right-to-left. */
    MERGE_RIGHT_ASSOCIATIVE {
      @Override

        A accum = collector.supplier().get();
        for (T input : inputs) {
          A newAccum = collector.supplier().get();
          collector.accumulator().accept(newAccum, input);
          accum = collector.combiner().apply(accum, newAccum);
        }
        return accum;
      }
    },
    /** Get one accumulator for each element and merge the accumulators right-to-left. */
    MERGE_RIGHT_ASSOCIATIVE {
      @Override

      }
    }

    /*
     * While the current implementation returns `this`, that's not something we mean to guarantee.
     * Anyway, the purpose of this method is to implement a BinaryOperator combiner for a Collector,
     * so its return value will get used naturally.
     */
    @SuppressWarnings("CanIgnoreReturnValueSuggester")
    ImmutableTableCollectorState<R, C, V> combine(

      }
    }

    /*
     * While the current implementation returns `this`, that's not something we mean to guarantee.
     * Anyway, the purpose of this method is to implement a BinaryOperator combiner for a Collector,
     * so its return value will get used naturally.
     */
    @SuppressWarnings("CanIgnoreReturnValueSuggester")
    ImmutableTableCollectorState<R, C, V> combine(

    buffer[j] = tmp;
  }

  /*
   * While the current implementation returns `this`, that's not something we mean to guarantee.
   * Anyway, the purpose of this method is to implement a BinaryOperator combiner for a Collector,
   * so its return value will get used naturally.
   */
  @SuppressWarnings("CanIgnoreReturnValueSuggester")
  TopKSelector<T> combine(TopKSelector<T> other) {