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-(*
-    Example proof script for Isabelle Proof General.
-
-    $Id$
-*)    
-
-Goal "(A & B)-->(B & A)";
-br impI 1;
-br conjI 1;
-be conjE 1;
-ba 1;
-be conjE 1;
-ba 1;
-qed "and_comms";