With Superior. I state that there is a chance of getting up to a +5 jump. With a +5 Success and a book4 = Item Rank +5 +4. So if you used a rank 1 item. It is possible to get a rank 10 item with Superior. Because. Max result is Initial Rank of 1 + 5 result +4 book. 1+5+4= 10.
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