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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 663.850.014.040.500.500.500 Cyclooxygenase 2 Inhibitors D27.505.696.663.850.014.580 Analgesics, Short-Acting D27.505.696.663.850.014.610 Calcitonin Gene-Related Peptide Receptor Antagonis ts D27.505.696.663.850.014. ...