HIERARCHY = ('Table of Contents', './README.md', (
    ('Prerequisites', './prereq.md', (
        ('Prerequisites: Instructor', './prereq_instructor.md', ()),
        ('Prerequisites: Students', './prereq_student.md', ()),
    )),
    ('Setting Everything Up', './setup.md', (
        ('Installing/Updating CircuitPython', './setup_board.md', ()),
        ('Connecting to Your Computer', './setup_connection.md', ()),
        ('Development Environment', './setup_environment.md', ()),
    )),
    ('Exercises', './exercises.md', (
        ('Program 1: Buttons and Red LED', './exercise_buttons_and_leds.md', ()),
        ('Program 2: Touchpads', './exercise_touchpads.md', ()),
        ('Program 3: NeoPixels', './exercise_neopixels.md', ()),
        ('Program 4: Thermister', './exercise_thermistor.md', ()),
        ('Program 5: Light Sensor', './exercise_phototransistor.md', ()),
        ('Program 6: Accelerometer', './exercise_accelerometer.md', ()),
        ('Program 7: Sound', './exercise_sound1.md', ()),
    )),
    ('Final Remarks', './final.md', ()),
))
