>>Also, in Hollerith code the letters J-R use the 11 punch.

Had to look that up, as it predates what I had believed to be elder computer memories. I caught the very end of the card punch era when the Uni Computer Society purchased a mainframe for all cash on hand = $26 and a six-pack of beer. So charmed were the industrial sellers to declare this the winning bid, that they spent a fortune delivering it to the Human Sciences building that was being fitted out at the time, creating a downstream furor when it was discovered that it couldn't be gotten out again without dismantling interior walls. Those were the days. This one had the latest multi-platter Winchester drive that sounded like a flying saucer when it spooled up before activating the circuit breakers, plunging lecture theaters into darkness. Yes, my enjoyment of chaos certainly was well-served by that wonderful machine. ;-)