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Dec 28, 2022 at 14:15 comment added user3067860 @Sneftel There is no programming (unless you consider having light bulbs in houses to be programming). If this is an external arbiter, then so is "put coins in a bag" or anything along those lines. (Yes, this is less practical to do, but the OP has left it open for "elaborate non-programmable devices", which is what this is.)
Dec 28, 2022 at 12:39 comment added Sneftel From the OP: "And does not require an external arbiter or programmed device"
Dec 27, 2022 at 23:45 history answered user3067860 CC BY-SA 4.0