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The "stacking" issue has always disturbed me. The judge has absolute discretion to stack the sentences in this situation, but the jury is never told this. I would think that if they wanted to give him 20 they would have said 20.
Edit: On the parole issue, the jury was instructed that a defendant charged with this sort of crime is not eligible for parole until 1/2 of his sentence is served. Then they are instructed that they are not to consider that law when assessing punishment against this particular defendant. And it is one screwed up law.