@Override
    public SideEffectCapStep<S, E> clone() {
        final SideEffectCapStep<S, E> clone = (SideEffectCapStep<S, E>) super.clone();
        clone.sideEffectCapableSteps = null;
        return clone;
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/SideEffectCapStep.java