* @param element the element to look for
   * @return the nonnegative number of occurrences of the element
   */
  @Override
  public int count(@CheckForNull Object element) {
    AtomicInteger existingCounter = Maps.safeGet(countMap, element);
    return (existingCounter == null) ? 0 : existingCounter.get();
  }

  /**
   * {@inheritDoc}
   *

   * @param element the element to look for
   * @return the nonnegative number of occurrences of the element
   */
  @Override
  public int count(@CheckForNull Object element) {
    AtomicInteger existingCounter = Maps.safeGet(countMap, element);
    return (existingCounter == null) ? 0 : existingCounter.get();
  }

  /**
   * {@inheritDoc}
   *

        entryIterator.remove();
      }
      size--;
      canRemove = false;
    }
  }

  @Override
  public int count(@CheckForNull Object element) {
    Count frequency = Maps.safeGet(backingMap, element);
    return (frequency == null) ? 0 : frequency.get();
  }

  // Optional Operations - Modification Operations

  /**
   * {@inheritDoc}
   *

import static com.google.common.base.Predicates.in;
import static com.google.common.base.Predicates.not;
import static com.google.common.collect.Maps.safeContainsKey;
import static com.google.common.collect.Maps.safeGet;
import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Function;

      return Maps.safeContainsKey(submap, key);
    }

    @Override
    @CheckForNull
    public Collection<V> get(@CheckForNull Object key) {
      Collection<V> collection = Maps.safeGet(submap, key);
      if (collection == null) {
        return null;
      }
      @SuppressWarnings("unchecked")
      K k = (K) key;
      return wrapCollection(k, collection);
    }

      /*
       * I assume that this check can't fail because JELLY_BEAN will be present only if we're
       * running under Jelly Bean or higher. But it seems safest to check.
       */
      if (version < jellyBean) {
        return new ThrowingCreator();
      }

      // Don't merge these catch() blocks, let alone use ReflectiveOperationException directly:
      // b/65343391

      return Maps.safeContainsKey(submap, key);
    }

    @Override
    @CheckForNull
    public Collection<V> get(@CheckForNull Object key) {
      Collection<V> collection = Maps.safeGet(submap, key);
      if (collection == null) {
        return null;
      }
      @SuppressWarnings("unchecked")
      K k = (K) key;
      return wrapCollection(k, collection);
    }