protected static IllegalStateException elementAlreadyRemoved(final Class<? extends Element> clazz, final Object id) {
        return new IllegalStateException(String.format("%s with id %s was removed.", clazz.getSimpleName(), id));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerElement.java