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var js, fjs = d.getElementsByTagName(s)[0];
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js.src = ‘https://connect.facebook.net/fr_FR/sdk/xfbml.customerchat.js#xfbml=1&version=v2.12&autoLogAppEvents=1’;
fjs.parentNode.insertBefore(js, fjs);
}(document, ‘script’, ‘facebook-jssdk’));