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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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// File: contracts/common/UnstructuredStorage.sol
/*
 * SPDX-License-Identitifer:    MIT
 */
pragma solidity ^0.4.24;
library UnstructuredStorage {
    function getStorageBool(bytes32 position) internal view returns (bool data) {
        assembly { data := sload(position) }
    }
    function getStorageAddress(bytes32 position) internal view returns (address data) {
        assembly { data := sload(position) }
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/**
 *Submitted for verification at Etherscan.io on 2020-02-06
*/
// File: contracts/acl/IACL.sol
/*
 * SPDX-License-Identifier:    MIT
 */
pragma solidity ^0.4.24;
interface IACL {
    function initialize(address permissionsCreator) external;
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// File: contracts/acl/IACL.sol
/*
 * SPDX-License-Identitifer:    MIT
 */
pragma solidity ^0.4.24;
interface IACL {
    function initialize(address permissionsCreator) external;
    // TODO: this should be external
    // See https://github.com/ethereum/solidity/issues/4832
    function hasPermission(address who, address where, bytes32 what, bytes how) public view returns (bool);
}
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// SPDX-FileCopyrightText: 2020 Lido <info@lido.fi>
// SPDX-License-Identifier: GPL-3.0
/* See contracts/COMPILERS.md */
pragma solidity 0.4.24;
import "@aragon/os/contracts/apps/AragonApp.sol";
import "@aragon/os/contracts/lib/math/SafeMath.sol";
import "@aragon/os/contracts/lib/math/SafeMath64.sol";
import "solidity-bytes-utils/contracts/BytesLib.sol";
import "./interfaces/ILido.sol";
import "./interfaces/INodeOperatorsRegistry.sol";
import "./interfaces/IDepositContract.sol";
import "./interfaces/ILidoExecutionLayerRewardsVault.sol";
import "./StETH.sol";
import "./lib/StakeLimitUtils.sol";
interface IERC721 {
    /// @notice Transfer ownership of an NFT
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