Class CheckboxValidationBuilder

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// Add a checkBox item to a form and require exactly two selections.constform=FormApp.create('My Form');constcheckBoxItem=form.addCheckboxItem();checkBoxItem.setTitle('What two condiments would you like on your hot dog?');checkBoxItem.setChoices([checkBoxItem.createChoice('Ketchup'),checkBoxItem.createChoice('Mustard'),checkBoxItem.createChoice('Relish'),]);constcheckBoxValidation=FormApp.createCheckboxValidation().setHelpText('Select two condiments.').requireSelectExactly(2).build();checkBoxItem.setValidation(checkBoxValidation);