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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 illustrates a scenario with two radio buttons for contact preferences: email and phone. If the user selects email, the phone input field is treated as optional. Conversely, if the user selects phone, the phone input becomes required. This involves modifying the required validator function on the phone form control based on the user's selection. The tutorial emphasizes the need to include the HTML for the phone input element, which will closely resemble that of the email input element.
