A 58-year-old man with hypertension presents with palpitations and is found to have a regular narrow-complex tachycardia at exactly 150 bpm on ECG. The rhythm strip shows the characteristic pattern marked **A** in the diagram — regular, repetitive waves at approximately 300 bpm with no isoelectric baseline between them. Which of the following best describes the electrophysiological mechanism underlying this atrial rate?
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