All

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 C04 Neoplasms D009369 +
  C04.588 Neoplasms by Site D009371 +
   C04.588.443 Head and Neck Neoplasms D006258 +
    C04.588.443.591 Mouth Neoplasms D009062 +
     C04.588.443.591.545 Leukoplakia, Oral D007972 +
       C04.588.443.591.545.500 Leukoplakia, Hairy D017733 
 C04 Neoplasms D009369 +
  C04.834 Precancerous Conditions D011230 +
   C04.834.512 Leukoplakia D007971 +
    C04.834.512.513 Leukoplakia, Oral D007972 +
      C04.834.512.513.500 Leukoplakia, Hairy D017733 
 C07 Stomatognathic Diseases D009057 +
  C07.465 Mouth Diseases D009059 +
   C07.465.565 Mouth Neoplasms D009062 +
    C07.465.565.545 Leukoplakia, Oral D007972 +
      C07.465.565.545.500 Leukoplakia, Hairy D017733