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A simple address registry contract for Ethereum
pragma solidity >=0.4.22 <0.6.0;
contract registry {
address[] public addresses;
mapping(address => bool) public contains;
function register() public {
contains[msg.sender] = true;
function getSize() public view returns (uint) {
return addresses.length;
function getWinner(uint index) public view returns (address) {
return addresses[index];
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