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@tuban_muzuru @rysiek @futurebird Depends on prior knowledge of the deck, because all shuffles (other than a tabled casino wash, but even that can be manipulated to some extent) are non-random.

Believe it or not, it takes around 2,500 standard overhand shuffles to fully randomize a prearranged deck! A sloppy riffle shuffle is more efficient, achieving this in only seven shuffles - but a perfect, card-for-card interweaving of the packets will restore the deck to original order in eight shuffles.