In the short animation SunDay, Rikka flips through the Lever Solver book. To rig up the book, I used set driven keys as below. (How to set up SDK can be read in my post Adding Set Driven Keys to animate a hand in Maya.)
Now, I wanted Rikka to be able to flip through pages twice. So I wanted to duplicate the page mesh, page jonts, and the SDKs associated to them so I don’t have to rig up the new page. To do so, you go to Edit => Duplicate Special  and tick Duplicate input graph.
I translated the new page down a little and there was a book that could be flipped twice. To be able to flip through more pages, keep duplicating the page with the input graph ticked.