On Sunday, 17 January 2021 at 10:37:10 UTC, Ola Fosheim Grøstad wrote: > On Sunday, 17 January 2021 at 04:03:30 UTC, Bruce Carneal wrote: >> > > This "bijection" strategy is interesting. (I assume you think > of bijective functions in mathematics?) Yes, one-to-one and onto (and we've wandered quite a ways OT). Good luck.