Plotto encompases what Michael Chase Walker calls the "Premise" and the "High Concept" [Power Screenwritng].

The premise is of course the result of "A clause" + "B Clause" results in "C Clause"

The high concept (call it the story / plot) in a capsule form is the "conflict event(s)" connected to the "B Clause"

The Story should "prove" the premise...

More stuff connected to Plotto -- the publisher of one of the recent release of Plotto (FIGApp.net) has some related downloads--

http://figapps.net/downloads.html

There is also "Fiction Idea Generator" app for the iPad or the iPhone...see the links at the bottom of the page here: http://figapps.net/fig.html

There is a free version available at Amazon for android devices --  http://www.amazon.com/FigApps-Net-Limited-Fiction-Idea-Generator/dp/B007IUQCCU/ref=sr_1_1?ie=UTF8&qid=1387635302&sr=8-1&keywords=Fiction+Idea+Generator