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@matthew_d_green @sevenps if unfamiliar with problem, check out Def 2.2 in http://t.co/NjNgcrZT5S that is a *plain sum* over all probs
@matthew_d_green @sevenps if unfamiliar with problem, check out Def 2.2 in http://t.co/NjNgcrZT5S that is a *plain sum* over all probs