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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 840.109 Amber D05.750.078.840.219 Balsams D05.750.078.840.490 Frankincense D05.750. ... 500.109 Amber D20.215.721.500.219 Balsams D20.215.721.500.354 Frankincense D20.215. ...