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 F01 Behavior and Behavior Mechanisms D001520 +
  F01.145 Behavior D001519 +
   F01.145.209 Communication D003142 +
    F01.145.209.908 Verbal Behavior D014705 +
     F01.145.209.908.677 Speech D013060 
       F01.145.209.908.677.610 Speech Intelligibility D013065 
 G11 Musculoskeletal, Neural, and Ocular Physiology D009143 +
  G11.561 Nervous System Physiology D009424 +
   G11.561.854 Speech D013060 
     G11.561.854.650 Speech Acoustics D013061 
     G11.561.854.686 Speech Intelligibility D013065 
 L01 Information Science D007254 +
  L01.143 Communication D003142 +
   L01.143.506 Language D007802 +
    L01.143.506.423 Language Arts D007803 +
     L01.143.506.423.676 Speech D013060