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import Head from 'next/head'
import React from 'react'
function Foo() {
const [displayed, toggle] = React.useState(true)
return (
<>
{displayed ? (
<Head>
<title>B</title>
</Head>
) : null}
<button onClick={() => toggle(!displayed)}>toggle</button>
</>
)
}
export default () => {
return (
<>
<Head>
<title>A</title>
</Head>
<Foo />
</>
)
}
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