return sortByNumericValue(calculator).first();
    }

<<<<<<< HEAD
    private Element safeGet(int index) {
=======
    @Override
    public String join(String combiner) {
        StringBuilder joined = new StringBuilder();

        for (int i = 0, size = size(); i < size; i++) {
            joined.append(get(i));
            if (i < size - 1)
                joined.append(combiner);
        }

        return joined.toString();
    }

    private void ensureNotEmpty() {
>>>>>>> 8541f310500c82511a3a4cd157ff252d94a3224c
        if (isEmpty())
            throw new ListWasEmptyException();

        return sortByNumericValue(calculator).first();
    }

    @Override
    public String join(String combiner) {
        StringBuilder joined = new StringBuilder();

        for (int i = 0, size = size(); i < size; i++) {
            joined.append(get(i));
            if (i < size - 1)
                joined.append(combiner);
        }

        return joined.toString();
    }
    
    private Element safeGet(int index) {
        if (isEmpty())
            throw new ListWasEmptyException();