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type t

class type implementation = object
  method contains : Concepts.Tuple.t -> (bool, Concepts.Condition.condition) result
end

val make : #implementation -> Handle.protocol
val from : Handle.t -> t Handle.interface option
val require : Handle.t -> (t Handle.interface, Concepts.Condition.condition) result
val contains : t Handle.interface -> Concepts.Tuple.t -> (bool, Concepts.Condition.condition) result