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In Part 14 of the Angular 6 tutorial, the focus is on dynamically adding or removing validators at runtime in a reactive form. The example involves two contact preference radio buttons: email and phone. When "email" is selected, the phone input field becomes optional. However, if the preference changes to "phone," the phone input field is required. Therefore, the required validator function must be added or removed from the phone form control based on the user's selection. The tutorial demonstrates how to implement the necessary HTML for the phone input element, which closely resembles that of the email input element.
