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function loadScript(src, type = "text/javascript",async = true) {
    var scriptEle = document.createElement('script');
    scriptEle.src = src;
    scriptEle.type = type;
    scriptEle.async = async;
    scriptEle.defer = true;

    return new Promise((resolve, reject) => {
        scriptEle.onload = e => resolve(e);
        scriptEle.onerror = e => reject(e);
        document.head.appendChild(scriptEle);
    });

}


// example
loadScript('https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js')
    .then(() => {
        mermaid.initialize({
            startOnLoad: true,
            theme: 'neutral',
            pie: {
                useMaxWidth: false
            }
        });
    })
    .catch(e => {
        console.error("failed to load mermaid.min.js:", e)
    })

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window.MathJax = {
    tex: {
        tags: 'ams'
    }
}