If each set of four were to be repeated, it'd be impossible ... This is probably what you are asking, but i did not see it so clearly at first.
Indeed, though it wasn't obvious to me at first either.
In reply to Re^2: (OT) A different kind of 'combinatorics'
by BrowserUk
in thread (OT) A different kind of 'combinatorics'
by BrowserUk
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