ab|cd|ef|gh. Map each chunk by 00→0, 01→1, 10→2, while 11 falls outside the grid. Then build a larger grid by
x = 3·v(ab) + v(cd) and y = 3·v(ef) + v(gh), giving a clean 0–8 grid.
0, 1, and ?.ab|cd|ef|ghx = 3·v(ab)+v(cd), y = 3·v(ef)+v(gh)00→0, 01→1, 10→2, 11→off-grid| bits | dec | prime | point |
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