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import psutil
import time

def monitor_cpu_usage(interval, duration, log_file):
    with open(log_file, 'w') as f:
        for i in range(duration):
            cpu_usage = psutil.cpu_percent(interval=interval)
            f.write(f'{time.strftime("%Y-%m-%d %H:%M:%S")} - CPU usage: {cpu_usage}%
')
            time.sleep(interval)

monitor_cpu_usage(1, 10, 'cpu_usage.log')

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