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class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0,
    };
  }

  increment = () => {
    this.setState(prevState => {
      return {
        count: prevState.count + 1,
      };
    });
  };

  render() {
    return (
      <div onClick={this.increment}>{this.props.children(this.state)}</div>
    );
  }
}

class App extends React.Component {
  render() {
    return (
      <Counter>
        {state => (
          <div>
            <h1>The count is: {state.count}</h1>
          </div>
        )}
      </Counter>
    );
  }
}