
2012 August 28:

[Point to two out of several piles]
  Shuffle those piles together and spread them out here
  -- "them" is not taken as referring to the result pile,
  because it is now only one pile, and it is not taken
  as referring to the cards that were shuffled, because
  the last structureType used was "pile".  Instead, it
  is taken as referring to all of the piles.
