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No two electrons may have all their quantum numbers alike.
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End flanges should be equal in width.
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The distance between adjacent holes should be the same.
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The crystals were of uniforthickness.
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Equal volumes of gases and vapours under the same conditions of ... contain identical numbers of molecules.
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Electrons are identical in charge.
Русско-английский научно-технический словарь переводчика. Михаил Циммерман, Клавдия Веденеева. 2003.