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+(*
+    Example proof script for Isabelle Proof General.
+
+    $Id$
+
+    Same as Example.ML, except using X-Symbol input tokens.
+*)    
+
+Goal "A \\<and> B \\<longrightarrow> B \\<and> A";
+by (rtac impI 1);
+by (etac conjE 1);
+by (rtac conjI 1);
+by (assume_tac 1);
+by (assume_tac 1);
+qed "and_comms";