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signature Subst = sig eqtype 'a subs val id : 'a subs val cons : 'a subs * 'a -> 'a subs val shift : int * 'a subs -> 'a subs val lift : int * 'a subs -> 'a subs val is_id : 'a subs -> bool val exp_rel : 'a subs * int -> int * 'a option val comp : ('a subs * 'a -> 'a) -> 'a subs * 'a subs -> 'a subs end
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