V. “NUMERICAL PLANES”: Collections 15 – 18

15. Odd Products in “Symmetrical Number Planes”

16. “Symmetrical Number Planes” for “Orthogonal Prime Axes”

17. The OrthoDiagonal Nature of “Digital Sums”: Leading Digits x 10 + Last Digit

18. “Digital Sums” in “Symmetrical Number Planes”

NEXT: VI. SUMS and PRODUCTS: Collections 19 – 22

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