gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/GroupSideEffectStep.java [100:110]:
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    public void modulateBy(final Traversal.Admin<?, ?> kvTraversal) {
        if ('k' == this.state) {
            this.keyTraversal = this.integrateChild(kvTraversal);
            this.state = 'v';
        } else if ('v' == this.state) {
            this.setValueTraversal(kvTraversal);
            this.state = 'x';
        } else {
            throw new IllegalStateException("The key and value traversals for group()-step have already been set: " + this);
        }
    }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/GroupStep.java [90:100]:
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    public void modulateBy(final Traversal.Admin<?, ?> kvTraversal) {
        if ('k' == this.state) {
            this.keyTraversal = this.integrateChild(kvTraversal);
            this.state = 'v';
        } else if ('v' == this.state) {
            this.setValueTraversal(kvTraversal);
            this.state = 'x';
        } else {
            throw new IllegalStateException("The key and value traversals for group()-step have already been set: " + this);
        }
    }
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