Umucyo udasanzwe nubutaka budasanzwe · Umucyo udasanzwe · Lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium. · Isi idasanzwe idasanzwe · Terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, na yttrium. · Ukurikije ibiranga amabuye y'agaciro, ni ...
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