#regular_recurrence__regularrecurrence__rhythm  recurring at regular intervals
  supertype:  #cyclicity  the quality of recurring at intervals
  subtype:  #cardiac_rhythm__cardiacrhythm__heart_rhythm__heartrhythm  the rhythm of a beating heart
     subtype:  #atrioventricular_nodal_rhythm__nodal_rhythm__nodalrhythm  the normal cardiac rhythm when the heart is controlled by the atrioventricular node

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