-- Supported sentences from the first paragraph of the textbook.
Exception: still had to remove two adverbs from the first paragraph.
-- Fixed a remaining issue with cycles in 'selectTopics'.
-- Used pattern matching on lists to better match binary rules
embedded in a tree node's children. e.g. match VP -> ADVP VB SBAR
the same as VP -> VB SBAR.

Signed off by: Mark Farrell<markfarr2011@gmail.com>