(* All of the following are considered preliminaries *)
From Undecidability.HOU Require Export std.tactics std.reductions std.misc std.decidable
        std.countability std.enumerable std.retracts
        std.lists.basics std.lists.advanced std.lists.misc
        std.ars.basic std.ars.confluence std.ars.normalisation
        std.ars.evaluator std.ars.list_reduction.