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We report on the first theoretical investigation of M-F-dependent lifetimes due to interference between a magnetic octupole transition and a hyperfine induced electric quadrupole transition. Extensive multiconfiguration Dirac-Fock calculations are used to model the hyperfine quenching of the magnetic octupole decay of 3d(9)4s D-3(3) and the state mixing between the D-3(3) and D-3(2) due to hyperfi
