They do<p><a href="https://www.google.co.uk/search?q=%22so+you+add+%22syn_maxfan%22+constraints+to+prevent+the+%22optimization%22&oq=%22so+you+add+%22syn_maxfan%22+constraints+to+prevent+the+%22optimization%22&aqs=chrome..69i57.1208j0j7&sourceid=chrome&es_sm=119&ie=UTF-8#q=%22syn_maxfan+constraints%22&filter=0" rel="nofollow">https://www.google.co.uk/search?q=%22so+you+add+%22syn_maxfa...</a><p>Possibly you were searching for a thread that was too recent to have been indexed?