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serie 4n + 2
радиоакт.
uranium series
;
uranium radioactive series
;
4n + 2 series
;
uranium-radium
radioactive
series
;
uranium
radioactive
family
;
radioactive family of uranium
;
4n + 2 family
;
uranium-radium
radioactive
family
;
radioactive family of uranium-radium
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