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You can exclude specific choices from a Symfony dropdown form type by setting the "choices" option to an array of key-value pairs, where the keys are the values of the options and the values are the labels. Then, use the "choices_exclude" option to specify which values to exclude from the dropdown.

Example:

$form = $this->createFormBuilder()
    ->add('my_options', ChoiceType::class, [
        'choices' => [
            'Option 1' => 'option1',
            'Option 2' => 'option2',
            'Option 3' => 'option3',
            'Option 4' => 'option4',
        ],
        'choices_exclude' => ['option2', 'option3'],
    ])
    ->getForm();

In this example, the dropdown will show four options ("Option 1", "Option 2", "Option 3", and "Option 4"), but exclude "Option 2" and "Option 3".