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// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
// BuryShib is the coolest pit in town. You come in with some Shib, and leave with more! The longer you stay, the more Shib you get.
//
// This contract handles swapping to and from xShib.
contract BuryShib is ERC20("xShib Staked Shiba Inu", "xSHIB"){
    using SafeMath for uint256;
    IERC20 public immutable shib;
    // Define the Shib token contract
    constructor(IERC20 _shib) public {
        require(address(_shib) != address(0), "_shib is a zero address");
        shib = _shib;
    }
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/**
 *Submitted for verification at Etherscan.io on 2019-08-02
*/
// File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol
pragma solidity ^0.5.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
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