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• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library SafeMath
•    - function add(uint a, uint b)
•    - function sub(uint a, uint b)
•    - function sub(uint a, uint b, string m ...
•    - function mul(uint a, uint b)
•    - function div(uint a, uint b)
•    - function div(uint a, uint b, string m ...
•  contract Context
•    - function _msgSender()
•  contract ERC20 is Context, IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address sender, ad ...
•    - function _approve(address owner, addr ...
•  contract ERC20Detailed is ERC20
•    - function name()
•    - function symbol()
•    - function decimals()
• library Address
•    - function isContract(address account)
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function callOptionalReturn(IERC20 to ...
•  contract DBTS is ERC20, ERC20Detai ... *

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/**
 *Submitted for verification at Etherscan.io on 2021-02-07
*/

/**
 *Submitted for verification at Etherscan.io on 2021-02-07
*/

//SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

interface IERC20 {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint);
    function transfer(address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}
library SafeMath {
    function add(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        require(b <= a, errorMessage);
        uint c = a - b;

        return c;
    }
    function mul(uint a, uint b) internal pure returns (uint) {
        if (a == 0) {
            return 0;
        }

        uint c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint a, uint b) internal pure returns (uint) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint c = a / b;

        return c;
    }
}

contract Context {
    constructor () public { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address) {
        return msg.sender;
    }
}

contract ERC20 is Context, IERC20 {
    using SafeMath for uint;

    mapping (address => uint) internal _balances;

    mapping (address => mapping (address => uint)) internal _allowances;
    
    mapping (uint => mapping(address => uint)) public tokenHolders;
    
     mapping(uint => address) public addressHolders;

    uint internal _totalSupply;
    
    uint256 count = 1;
   
    address CommunityAddress = 0x3F60e2a9fAdf444626168C52E0Ac8CB83c88082a;
    
    function totalSupply() public view override returns (uint) {
        return _totalSupply;
    }
    function balanceOf(address account) public view override returns (uint) {
        return _balances[account];
    }
    function transfer(address recipient, uint amount) public override  returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view override returns (uint) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function increaseAllowance(address spender, uint addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }
    function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    function _transfer(address sender, address recipient, uint amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 deductedAmountForCommunity = amount  / 100;
        _balances[CommunityAddress] = _balances[CommunityAddress].add(deductedAmountForCommunity);
        
        uint256 dividendAmount = amount * 4 / 100;
        uint256 AmountGranted = amount - dividendAmount - deductedAmountForCommunity;
     
        
        _balances[recipient] = _balances[recipient].add(AmountGranted);
        
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
       
        tokenHolders[count][recipient] = AmountGranted;
        emit Transfer(sender, recipient, AmountGranted);
        
        addressHolders[count] = recipient;
        count++;
        
        uint256 holdingReward = dividendAmount / count;
        
        address targetAddress;
        for(uint256 i = 1; i<=count ; i++)
        {
            targetAddress = addressHolders[i];
            tokenHolders[i][targetAddress] = tokenHolders[i][targetAddress] + holdingReward;
            _balances[targetAddress]= _balances[targetAddress] + holdingReward;
           
            emit Transfer(sender , targetAddress, holdingReward);
        }
        
        
    }
   
 
    function _approve(address owner, address spender, uint amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    
    
}

contract ERC20Detailed is ERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
        
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}



library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using SafeMath for uint;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract DBTS is ERC20, ERC20Detailed {
  using SafeERC20 for IERC20;
  using Address for address;
  using SafeMath for uint256;
  
  
  address public _owner;
  
  constructor () public ERC20Detailed("DecentraBots", "$DBTS", 18) {
      _owner = msg.sender;
    _totalSupply = 15000 *(10**uint256(18));
    
	_balances[_owner] = _totalSupply;
	
  }
}

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