en reciprocity principle (n)
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en reciprocal Source: English Wiktionary
en reciprocity principle (n)
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en system Source: English Wiktionary
en reciprocity principle (n)
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en relationship Source: English Wiktionary
en reciprocity principle (n)
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en scientific Source: English Wiktionary
en reciprocity principle (n)
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en physical Source: English Wiktionary