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+Isabelle Reference Manual. Report 283
+
+This manual is a comprehensive description of Isabelle, including all
+commands, functions and packages. Functions are organized according to the
+task they perform. In each section, basic functions appear before advanced
+ones. The Index provides an alphabetical listing. It is intended as a
+reference, not for casual reading. The manual assumes familiarity with the
+basic concepts explained in Report 280, Introduction to Isabelle.