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ряд 4n + 3 stresses
радиоакт.	actinium radioactive series; 4n + 3 series; uranium-actinium radioactive series; uranium-actinium series; actinium family; actinium radioactive family; radioactive family of actinium; 4n + 3 family; uranium-actinium family; uranium-actinium radioactive family; radioactive family of uranium-actinium

ряд 4n + 3: 1 phrase in 1 subject

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