#rare_earth__rare-earth_element__lanthanoid__lanthanide__lanthanon  any element of the lanthanide series (atomic numbers 57 through 71)
  supertype:  chemical_element__element  any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
  subtype:  terbium_metal__terbiummetal  a separate group of related lanthanides, including terbium, europium, gadolinium, and sometimes dysprosium

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