This arrived back into my orbit today out of the blue and after a near forty-year absence! God I remember being able to solve this in a minute or so, with my eyes closed, back in the day but now I've to start all over again.
There's knack I know - but finding it is the problem.
Still, challenge grudgingly accepted!
(Maybe) more soon ...
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| Right, first step, remove all stickers! |

