chapter-2.md

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Testing	This is the title that Google shows on a search result.	This is the short description that Google shows on a search result.	This is a free excerpt of the chapter. To see the rest, you'll have to buy the book.

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function Square(props) {
    return (
        <button className="square" onClick={props.onClick}>
            {props.value}
        </button>
    );
}