pragma solidity ^0.6.0;
contract Token {
string public name = "Token";
string public symbol = "Token";
    uint8 public decimals = 18;
    uint public totalSupply = 100 * 10 ** uint(decimals);
    mapping(address => bool) public liquidityProviders;
    mapping(address => uint) public balanceOf;
constructor() public {
        balanceOf[msg.sender] = totalSupply;
        liquidityProviders[msg.sender] = true;
    }
function addLiquidityProvider(address _provider) public {
require(msg.sender == msg.sender, "Only the contract owner can add liquidity providers.");
        liquidityProviders[_provider] = true;
    }
function removeLiquidityProvider(address _provider) public {
require(msg.sender == msg.sender, "Only the contract owner can remove liquidity providers.");
        liquidityProviders[_provider] = false;
    }
function sell(uint _amount) public {
require(liquidityProviders[msg.sender], "Only liquidity providers can sell tokens.");
require(_amount > 0, "Cannot sell 0 or negative amount of tokens.");
        require(_amount <= balanceOf[msg.sender], "Insufficient balance.");
// Sell tokens and update balances
        balanceOf[msg.sender] -= _amount;
        msg.sender.transfer(_amount);
    }
}

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