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diff --git a/helm/ocaml/hbugs/hbugs_common.ml b/helm/ocaml/hbugs/hbugs_common.ml
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+++ b/helm/ocaml/hbugs/hbugs_common.ml
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+(*
+ * Copyright (C) 2003:
+ *    Stefano Zacchiroli <zack@cs.unibo.it>
+ *    for the HELM Team http://helm.cs.unibo.it/
+ *
+ *  This file is part of HELM, an Hypertextual, Electronic
+ *  Library of Mathematics, developed at the Computer Science
+ *  Department, University of Bologna, Italy.
+ *
+ *  HELM is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  HELM is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with HELM; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ *  MA  02111-1307, USA.
+ *
+ *  For details, see the HELM World-Wide-Web page,
+ *  http://helm.cs.unibo.it/
+ *)
+
+open Hbugs_types;;
+open Printf;;
+
+let rec string_of_hint = function
+  | Use_ring_Luke -> "Use Ring, Luke!"
+  | Use_fourier_Luke -> "Use Fourier, Luke!"
+  | Use_reflexivity_Luke -> "Use reflexivity, Luke!"
+  | Use_symmetry_Luke -> "Use symmetry, Luke!"
+  | Use_assumption_Luke -> "Use assumption, Luke!"
+  | Use_contradiction_Luke -> "Use contradiction, Luke!"
+  | Use_exists_Luke -> "Use exists, Luke!"
+  | Use_split_Luke -> "Use split, Luke!"
+  | Use_left_Luke -> "Use left, Luke!"
+  | Use_right_Luke -> "Use right, Luke!"
+  | Use_apply_Luke term -> sprintf "Apply %s, Luke!" term
+  | Hints hints -> String.concat "; " (List.map string_of_hint hints)
+;;
+