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A 76-year-old man with a history of diabetes mellitus and hypertension presents with progressively worsening exertional dyspnea, limiting his ambulation to approximately 10 meters. On physical examination, a forceful apex beat is noted along with a harsh crescendo-decrescendo ejection systolic murmur, loudest at the right upper sternal border and radiating to the carotid arteries. What is the most likely diagnosis?