Wed, 14 Feb 2007 10:06:15 +0100 haftmann cleanup
Wed, 14 Feb 2007 10:06:14 +0100 haftmann simpliefied instance statement
Wed, 14 Feb 2007 10:06:13 +0100 haftmann continued class tutorial
Wed, 14 Feb 2007 10:06:12 +0100 haftmann added class "preorder"
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