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Proof General is a generic (X)Emacs interface for proof assistants.
It can be instantiated for the proof assistant of your choice, and is
supplied ready-customised for Isabelle, Coq, LEGO, and PhoX, and,
-experimentally, for HOL98, Twelf, and ACL2.
+experimentally, several other systems.
Proof General includes these features, amongst others: