How do I activate the Child Lock-Out feature to prevent children from using the microwave?

To set the Child Lock-Out, press and hold the START button for 4 seconds until 'L' appears in the display. To cancel the lock, press and hold START again for 4 seconds until the 'L' disappears from the display. (Page 11)

From the official Kenmore Microwave Oven manual, page 11

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