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import time
import webbrowser

total_breaks = 3
break_count = 0  # type: int

print('This program started on: {0}'.format(time.ctime()))
while break_count < total_breaks:
    time.sleep(20) # Seconds
    webbrowser.open("https://classroom.udacity.com/courses/ud036/lessons/993460168/concepts/9977893120923")
    break_count += 1