All

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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.552 Metals, Alkaline Earth D008673 +
     D01.268.552.050 Barium D001464 
     D01.268.552.075 Beryllium D001608 
     D01.268.552.100 Calcium D002118 
     D01.268.552.437 Magnesium D008274 
     D01.268.552.775 Radium D011883 
     D01.268.552.850 Strontium D013324 
 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.539 Metals, Alkaline Earth D008673 +
     D01.552.539.124 Barium D001464 
     D01.552.539.288 Calcium D002118 
     D01.552.539.745 Radium D011883 
     D01.552.539.861 Strontium D013324