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    function subscribeCardListObserver() {
        var observer = new MutationObserver(function (mutations) {
            mutations.forEach(function (mutation) {
                iterable({ collection: mutation.addedNodes })
                    .filter(node => isACard(node))
                    .findFirst()
                    .ifPresent(node => updateCounterValue());
            });
        });
        observer.observe(references.components.cards, { childList: true });
    }