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// File: contracts/common/Proxy/IERCProxy.sol
pragma solidity 0.6.6;
interface IERCProxy {
    function proxyType() external pure returns (uint256 proxyTypeId);
    function implementation() external view returns (address codeAddr);
}
// File: contracts/common/Proxy/Proxy.sol
pragma solidity 0.6.6;
abstract contract Proxy is IERCProxy {
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// File: contracts/common/Proxy/IERCProxy.sol
pragma solidity 0.6.6;
interface IERCProxy {
    function proxyType() external pure returns (uint256 proxyTypeId);
    function implementation() external view returns (address codeAddr);
}
// File: contracts/common/Proxy/Proxy.sol
pragma solidity 0.6.6;
abstract contract Proxy is IERCProxy {
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// MKR Token
// hevm: flattened sources of src/mkr-499.sol
pragma solidity ^0.4.15;
////// lib/ds-roles/lib/ds-auth/src/auth.sol
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
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/**
Matic network contracts
*/
pragma solidity ^0.5.2;
contract Ownable {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
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pragma solidity 0.6.6;
import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol";
import {IRootChainManager} from "./IRootChainManager.sol";
import {RootChainManagerStorage} from "./RootChainManagerStorage.sol";
import {IStateSender} from "../StateSender/IStateSender.sol";
import {ICheckpointManager} from "../ICheckpointManager.sol";
import {RLPReader} from "../../lib/RLPReader.sol";
import {ExitPayloadReader} from "../../lib/ExitPayloadReader.sol";
import {MerklePatriciaProof} from "../../lib/MerklePatriciaProof.sol";
import {Merkle} from "../../lib/Merkle.sol";
import {ITokenPredicate} from "../TokenPredicates/ITokenPredicate.sol";
import {Initializable} from "../../common/Initializable.sol";
import {NativeMetaTransaction} from "../../common/NativeMetaTransaction.sol";
import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {AccessControlMixin} from "../../common/AccessControlMixin.sol";
import {ContextMixin} from "../../common/ContextMixin.sol";
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pragma solidity 0.6.6;
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import {AccessControlMixin} from "../../common/AccessControlMixin.sol";
import {RLPReader} from "../../lib/RLPReader.sol";
import {ITokenPredicate} from "./ITokenPredicate.sol";
import {Initializable} from "../../common/Initializable.sol";
contract ERC20Predicate is ITokenPredicate, AccessControlMixin, Initializable {
    using RLPReader for bytes;
    using RLPReader for RLPReader.RLPItem;
    using SafeERC20 for IERC20;
    bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE");
    bytes32 public constant TOKEN_TYPE = keccak256("ERC20");
    bytes32 public constant TRANSFER_EVENT_SIG = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;
    event LockedERC20(
        address indexed depositor,
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