Add a test for the 9 problem.
Add a test for the 9 problem.

The original C implementation contained a bug misclassifying the number 9 as
being in the SYMBOLS_OTHER group, not the NUMBERS group.  Add a test to
check for this.

Signed-off-by: brian m. carlson <738bdd359be778fee9f0fc4e2934ad72f436ceda@crustytoothpaste.net>

bk2204/daniel-ruby,bk2204/daniel-ruby