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  • Thanks for explaining the glitch pointed out in Nick Westgate's answer. Understanding such well "optimised" code (and its shortcomings) is hard, and answers like this make it that little bit easier. Commented Dec 15, 2016 at 21:11
  • Nice. Just a note: Jonno's listing is based on Bob Sander-Cederlof's. Commented Dec 15, 2016 at 22:17
  • @NickWestgate -- You're right -- I'll add that to the answer. Thanks for pointing it out. Commented Dec 15, 2016 at 22:19
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    and the same issue exists on the Commodore 64, but the line number range is different because the compared token has a different value. Commented Feb 12, 2017 at 2:37