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signature TREE = sig
type ('k, 'v) t
val empty: ('k, 'v) t
val insert: ('k -> 'k -> order) -> ('k, 'v) t -> 'k -> 'v
-> 'v option * ('k, 'v) t
val lookup: ('k -> 'k -> order) -> ('k, 'v) t -> 'k -> 'v option
val lookup2: ('k -> 'k -> order) -> ('k, 'v) t -> 'k ->
('v -> 'v option * 'a) * 'a -> 'a * ('k, 'v) t
val print: ('k, 'v) t -> ('k -> string) -> ('v -> string) -> unit
end
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