By the way, that hashing trick somehow reminds me of edge-notched cards[1]. (Not old enough to have used them, old enough to have seen and played with them.) [

By the way, that hashing trick somehow reminds me of edge-notched cards[1]. (Not old enough to have used them, old enough to have seen and played with them.) [1] https://boingboing.net/2008/06/17/edgenotched-cards-st.html https://boingboing.net/2008/06/17/edgenotched-cards-st.html