I absolutely hate videos (making them, anyway) - but thought it the best way to describe this concept. The workings should be obvious, esp. given the huge hump in the spine of my wallet. I'm not even sure what to call the thing, and seek assistance in tracing its roots. >>
>> https://youtu.be/kpuPPDDYbio
Origins of Two-Layer Extraction Concept
Origins of Two-Layer Extraction Concept
"The gnomes' ambition is handicapped by laziness." Adapted from Charles Bukowski, and clearly evident at http://www.gnominal.com