anchor.diff:  
     @override
     Widget build(BuildContext context) {
  +    final _formKey = GlobalKey<FormState>();
  +    final _primaryController = TextEditingController();
  +    final _secondaryController = TextEditingController();
  +    final _tokenController = TextEditingController();
  +
       return Scaffold(
         appBar: AppBar(
           title: const Text('Server Registration'),
  
positive.code: import 'package:flutter/material.dart';
  import 'package:font_awesome_flutter/font_awesome_flutter.dart';
  import 'package:gap/gap.dart';
  
  import '../../../../core/widgets/bullet_list.dart';
  import '../../../../core/widgets/page_body.dart';
  import '../widgets/custom_header_list_tile.dart';
  import '../widgets/registration_exit_dialog.dart';
  import '../widgets/registration_instruction.dart';
  
  
negative.code:         child: WillPopScope(
            onWillPop: () async => await showDialog(
              context: context,
              builder: (_) {
                return BlocProvider.value(
                  value: context.read<RegistrationHeadersBloc>(),
                  child: const RegistrationExitDialog(),
                );
              },
            ),
            child: Form(
              key: _formKey,
              child: ListView(
                padding: const EdgeInsets.all(8.0),
                children: [
                  const _StepOne(),
                  const Gap(8),
                  _StepTwo(
                    primaryController: _primaryController,
                    secondaryController: _secondaryController,
                    tokenController: _tokenController,
                  ),
                  const Gap(8),
                  const _StepThree(),
                  const Gap(8),
                  _StepFour(
                    formKey: _formKey,
                    primaryController: _primaryController,
                    secondaryController: _secondaryController,
                    tokenController: _tokenController,
                  ),
                ],
              ),
            ),
  