Renumbered again so that the messaging OO style comes immediately after the hash OO style

12-abstract-things/README.md

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+Style #11
+==============================
+
+Constraints:
+
+- The larger problem is decomposed into 'abstract things' that make
+  sense for the problem domain
+
+- Each abstract thing is described by what operations the things of
+  that abstraction can eventually do
+
+- Concrete things are then bound, somehow, to the abstractions; mechanisms
+  for doing that vary
+
+- The rest of the application uses the things not by what they are but
+  by they do in abstract
+
+Possible names:
+
+- Abstract things
+- Abstract data types