@Override
    public List<Pair<TraversalStrategy, Traversal.Admin<?, ?>>> getStrategyTraversals() {
        throw new UnsupportedOperationException("This instance is immutable");
    }
A data-only representation of a {@link TraversalExplanation} which doesn't re-calculate the "explanation" from
the raw traversal data each time the explanation is displayed.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/util/ImmutableExplanation.java