The 'XXXX' riddle
It should perhaps be said that there have been two Roman numeral tables, one in more archaic early times and a so called modern one; notwithstanding that one used by illiterate peoples, where figurative symbols were used.
The early one had an 'addictive' principle whereas in the later a 'subtractive' principle took place, were symbols added to a point and then subtracted.
Like so:
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