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