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Exactly how power should be shared, however, remains unclear, and varies considerably among companies that have embraced the reform.
NEWYORKER: The Kona Files
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"We know that the development and maturity of children varies considerably and parents know best what their children can deal with, " said Robin Duval, director of the British Board of Film Classification (BBFC).
BBC: 12A film certificate: Your views
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And mean household size varies considerably across Europe.
FORBES: Seriously, Cyprus Is Not Richer Than Germany
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Efficiency varies considerably from country to country.
UNESCO: MEDIA SERVICES
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In addition, vitamin D can be produced by the skin with sunlight exposure, but this ability decreases with age and varies considerably by geography, time of day or year, skin melanin content (darker skin produces less vitamin D) and sunscreen use.
CNN: How much vitamin D should someone over 55 take?