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Have you gotten the result? My calculation is about 5.5, see <a rel="nofollow" class="external text" href="https://docs.google.com/spreadsheets/d/1kXyctUwQblOP3sTfBjK9ZAEHOlxfDSDK/edit?usp=sharing&ouid=113518977177539087154&rtpof=true&sd=true">this spreadsheet</a>