{'electrocardiogram': [0, 0, 0, 1], 'ecg': [0, 0, 0, 2], 'cardiac muscles': [0, 0, 0, 1], 'sound waves': [0, 0, 2, 9], 'sound pattern': [0, 0, 0, 1], 'doctors': [0, 0, 1, 0], 'heart': [1, 0, 0, 0], 'vibration': [0, 0, 2, 2], 'electrical impulses': [1, 0, 0, 1], 'valves': [0, 0, 0, 1]}