content: import React, { Component } from 'react';
  import ErrorBoundary from './ErrorBoundary';
  import AppModel from './AppModel';
  import AppModelList from './AppModelList';
  import AppFormState from './AppFormState';
  
  export default class App extends Component {
    render() {
      return (
        <ErrorBoundary>
          <AppModel />
          <hr />
          <AppModelList />
          <hr />
          <AppFormState />
        </ErrorBoundary>
      );
    }
  }
  