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lxxiii Capital letters are preferable but they both have the same values.
(50-10) + 5 + 2 = xlvii in capital letters
Since we are talking about acronyms, the proper way to write it would be with capital letters.
Angles are represented by capital letters. Small letters refer to sides.
These letters (when capital) are the ones drawn with only straight lines. The other letters (again, when capital) are drawn with curves.