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// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6;
pragma abicoder v2;
interface IERC20 {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
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/**
 /$$   /$$ /$$$$$$  /$$$$$$  /$$$$$$$$ /$$   /$$ /$$$$$$
| $$  /$$/|_  $$_/ /$$__  $$| $$_____/| $$  /$$/|_  $$_/
| $$ /$$/   | $$  | $$  \__/| $$      | $$ /$$/   | $$  
| $$$$$/    | $$  |  $$$$$$ | $$$$$   | $$$$$/    | $$  
| $$  $$    | $$   \____  $$| $$__/   | $$  $$    | $$  
| $$\  $$   | $$   /$$  \ $$| $$      | $$\  $$   | $$  
| $$ \  $$ /$$$$$$|  $$$$$$/| $$$$$$$$| $$ \  $$ /$$$$$$
|/  \/|______/ \______/ |________/|/  \/|______/
                                                        
*/
// SPDX-License-Identifier: MIT     
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// File: contracts/interfaces/IUniswapV2Pair.sol
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);
    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);
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pragma solidity =0.6.6;
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
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// Copyright (C) 2015, 2016, 2017 Dapphub
// 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.
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.4.18;
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pragma solidity =0.5.16;
interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
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// File: contracts/interfaces/IFireBirdFormula.sol
// SPDX-License-Identifier: SEE LICENSE IN LICENSE
pragma solidity >=0.5.16;
/*
    Bancor Formula interface
*/
interface IFireBirdFormula {
    function getFactoryReserveAndWeights(address factory, address pair, address tokenA, uint8 dexId) external view returns (
        address tokenB,
        uint reserveA,
        uint reserveB,
        uint32 tokenWeightA,
        uint32 tokenWeightB,
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