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One can trace it back to ancient China and ancient Greece too: http://www.greenleaf.edu/pdf/donald_valeri.pdf http://www.greenleaf.edu/pdf/donald_valeri.pdf
by ddebernardy 8y ago
One can trace it back to ancient China and ancient Greece too:
http://www.greenleaf.edu/pdf/donald_valeri.pdf http://www.greenleaf.edu/pdf/donald_valeri.pdf