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 C11 Eye Diseases D005128 +
  C11.187 Conjunctival Diseases D003229 +
   C11.187.183 Conjunctivitis D003231 +
    C11.187.183.394 Keratoconjunctivitis D007637 +
      C11.187.183.394.550 Keratoconjunctivitis Sicca D007638 
      C11.187.183.394.520 Keratoconjunctivitis, Infectious D007639 

 C11 Eye Diseases D005128 +
  C11.204 Corneal Diseases D003316 +
   C11.204.564 Keratitis D007634 +
    C11.204.564.585 Keratoconjunctivitis D007637 +
      C11.204.564.585.630 Keratoconjunctivitis Sicca D007638 
      C11.204.564.585.500 Keratoconjunctivitis, Infectious D007639