protected Stream<String> getTraversalStepsAsString() {
        return Stream.concat(Stream.of(this.getOriginalTraversalAsString()), getIntermediates().map(Triplet::getValue2));
    }
Base class for "TraversalExplanation" instances and centralizes the key functionality which is the job of doing
{@link #prettyPrint()}.

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