async function a(urls) {
    let promises = [];
    let sorted = [];
    for (let i = 0; i < urls.length; i++) {
        let req = new Promise((resolve, reject) => {
            let url = urls[i];
            console.log("Loading " + url);
            imgReverser("/content/" + url).then(canvas => {
                console.log("Saving " + url);
                const uri = canvas.toDataURL('image/jpeg', 0.9);
                sorted.push([uri, i]);
                resolve();
            });
        });
        promises.push(req);
    }
    return Promise.all(promises).then(() => {
        sorted.sort((a, b) => a[1] - b[1]);
        for (let i = 0; i < sorted.length; i++) {
            let uri = sorted[i][0];
            let newP = document.createElement('img');
            newP.src = uri;
            newP.classList.add('asdfasdf');
            document.getElementById('chapter_container').append(newP);
        }
    });
}