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In the case of TbCo$_2$Zn$_{20}$, magnetic Bragg peaks corresponding to antiferromagnetic order are observed below $T_N$ $\\approx$ 2.5 K with a propagation vector of (0.5 0.5 0.5). On the other hand, TbFe$_2$Zn$_{20}$ undergoes a ferromagnetic transition at temperatures as high as 66 K which shows a high sensitivity to sample-to-sample variations. 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