#cyclicity  the quality of recurring at intervals
  supertype:  regularity  the quality of being characterized by a fixed principle or rate; "he was famous for the regularity of his habits"
  subtype:  regular_recurrence__regularrecurrence__rhythm  recurring at regular 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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