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Steiner(5,6,12) playing cards: games needed

Ages ago, I owned a set of cards, made mid-1997, each with one hexad from a Steiner(5,6,12) system. That rather crude set had been laser printed onto white paper; laminated; and guillotined. It, and many odd socks, have disappeared into the ether. What is such a system? It has 132 members, each of which contains […]