You could probably also have a tree of the ~32 most common words. At the very be...

mckilljoy on Feb 4, 2010 | parent | context | favorite | on: 'Vegetative' patient speaks to scientists using hi...

You could probably also have a tree of the ~32 most common words. At the very beginning you could have a branch to choose whether you want to pick the 'word' tree or the 'letter' tree.