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Old English in- (inherited)
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Old English on- (cognate)
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Middle English en- (inherited)
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Middle English in- (inherited)
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Old French en- (derived)
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Old French an- (mention)
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Old French en- (cognate)
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Old French an- (mention)
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Proto-Germanic *in (inherited)
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Proto-Indo-European *en (inherited)
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Tocharian B e(n)- (cognate)