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import java.util.Collection;
import java.util.Map;

/**
 * A dummy superclass to support GWT serialization of the element types of an {@link
 * ArrayListMultimap}. The GWT supersource for this class contains a field for each type.
 *
 * <p>For details about this hack, see {@code GwtSerializationDependencies}, which takes the same
 * approach but with a subclass rather than a superclass.
 *