+* Add the section (2.9) tests.
+
+* Figure out why TC.prop_c0120_identity4 and friends are failing.
+
+* Figure out why the section (2.5) c_ijk1 identity is failing.
+
+* Use distribution combinators[1] to get rid of the orphan instance
+ warnings.
+
+
+[1] http://stackoverflow.com/questions/4001861/how-small-should-i-make-make-modules-in-haskell