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  2. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A primary use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an (approximate) realization of a Lambertian scatterer; its apparent brightness (and exposure determination) therefore depends only on its orientation relative to the light source.

  3. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  4. Northern Ireland - Wikipedia

    en.wikipedia.org/wiki/Northern_Ireland

    Northern Ireland (Irish: Tuaisceart Éireann [ˈt̪ˠuəʃcəɾˠt̪ˠ ˈeːɾʲən̪ˠ] ⓘ; [13] Ulster Scots: Norlin Airlann) is a part of the United Kingdom in the north-east of the island of Ireland that is variously described as a country, province or region.

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