setInterval(function() {
    // Click on the treedots of first video in the list
    document.querySelector('#contents button#button').click();

    // Click on the "Save to playlist" button
    var save2playlist = document.evaluate('//yt-formatted-string[contains(text(),"Save to playlist")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
    save2playlist.snapshotItem(0).click();

    // search playlist with name wel
    var checkboxLabel = document.evaluate(
        '//tp-yt-paper-checkbox[@id="checkbox" and .//text()[contains(., "wel")]]',
        document,
        null,
        XPathResult.FIRST_ORDERED_NODE_TYPE,
        null
    ).singleNodeValue;

    if (checkboxLabel) {
        // Check if the descendant with id "checkmark" does not have the class "hidden"
        var checkmarkDescendant = checkboxLabel.querySelector('div#checkmark');

        if (checkmarkDescendant && checkmarkDescendant.classList.contains('hidden')) {
            // Click on the checkboxLabel
            checkboxLabel.click();
            console.log('Added video to playlist.');
        }
        else {
            console.log('Video is already in the playlist.');
        }
    }

    // Wait for a second before the second click
    setTimeout(function() {
        document.querySelector('#contents button#button').click();
    }, 2000);

    // Click on the "Remove from watch later" button
    var things = document.evaluate('//span[contains(text(),"Watch later")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
    for (var i = 0; i < things.snapshotLength; i++) {
        things.snapshotItem(i).click();
    }

}, 2000);