How can the difference in hair color based on residence in different continents of the world be explained? - Quora
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27 Illuminated Brunette Hair Color Ideas to Show Your Stylist | Brunette hair color, Curly hair trends, Colored hair tips
Enoch's Barber Center - Black is the most common hair color. Red is the rarest and only exists in about 1 percent of the world's population, with blonde hair found in 2
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