class AbstractType implements FormTypeInterface 
Methods
   buildForm(FormBuilderInterface $builder, array $options) Builds the form.  
   buildView(FormView $view, FormInterface $form, array $options) Builds the form view.  
   finishView(FormView $view, FormInterface $form, array $options) Finishes the form view.  
   configureOptions(OptionsResolver $resolver) Configures the options for this type.  
 string   getBlockPrefix() Returns the prefix of the template block name for this type.  
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