Nope, that doesn't do it, because using Torf ,fort, or Tor 4 produces a solution. My doubt is whether a digit can be inserted where there could be a word, but not one that produces a solution.

I haven't rigorously examined the sample solutions for lack of one that would establish the point, nor do I really care to.

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In reply to Re^3: One for the weekend: challenge by ysth
in thread One for the weekend: challenge by BrowserUk

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