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val merkle_tree : Tezos_proxy.Proxy.proxy_getter_input -> Tezos_protocol_environment.Proxy_context.M.key -> Tezos_proxy.Light_proto.Proof.merkle_leaf_kind -> Tezos_proxy.Light_proto.Proof.tree Tezos_proxy.Light_proto.Proof.t option Tezos_base.TzPervasives.tzresult Lwt.t