The author felt that this was necessary and would add to the quality of the font, as a congruent letter spacing is pleasing to the eye. The font family Champagne & Limousines is comprised of predominantly classically-shaped geometric letters, so it has a clean crisp appearance without as much spacing between the letters.
To name a few, capital letters B, D, J and most notably, W. Then the lowercase e which is angled, and lowercase w, which shares the style of the capital W. The numbers are also completely different.
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