* Shuffle intro
** introduce factories
** define composition
* Generators
** Broken factories
*** abstractly labelled shuffles - no reordering allowed, only composition.
*** single machine factories - what can you make? - fill in the list 
* Flips and Turns
** Look at the shuffles made by this flip and turn factory
** What groups are generated by single flips?
** What groups are generated by single turns?
** ? two flips ?
** ? two turns ?
** Two turns make a ______
** A flip and a turn makes a ______
* Double Generators