19-4= ___, 18-6=, 17-3= ___, 10-3= ___, 15-4= ___, 10-4= ___, 19-1= ___, 20-8= ___, 13-2= ___, 16-2= ___, 17-4= ___, 19-3= ___, 11-5=___, 12- 8=___, 9-6=___, 15-8=___, 17-10=___, 19-2=___, 20-10=___, 9-8=___.

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