Level 4
Level 6
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Promethium
Pm
Samarium
Sm
Europium
Eu
Gadolinium
Gd
Terbium
Tb
Dysprosium
Dy
Holmium
Ho
Erbium
Er
Thulium
Tm
Ytterbium
Yb
Lutetium
Lu
Hafnium
Hf
Tantalum
Ta
Tungsten
W
Rhenium
Re
