http://u.qdnx.org/file/erkan-20150219T100135-rlxjwka.html
yes. yes. I don't know what syntax you'd need for google. A third option is to search directly at various !gs instances: I don't know what your use case is, but e.g. #pareto-rule-wise it may be enough perhaps for you to use the results of 10 !gs instances