contract UpgradeabilityProxy is Proxy, UpgradeabilityStorage {
  /**
  * @dev This event will be emitted every time the implementation gets upgraded
  * @param version representing the version name of the upgraded implementation
  * @param implementation representing the address of the upgraded implementation
  */
    event Upgraded(string version, address indexed implementation);

    /**
    * @dev Upgrades the implementation address
    * @param version representing the version name of the new implementation to be set
    * @param implementation representing the address of the new implementation to be set
    */
    function _upgradeTo(string version, address implementation) internal {
        require(_implementation != implementation);
        _version = version;
        _implementation = implementation;
        Upgraded(version, implementation);
    }
}
/**
 * @title UpgradeabilityProxy
 * @dev This contract represents a proxy where the implementation address to which it will delegate can be upgraded
 */
function _upgradeTo(string version, address implementation) internal {
        require(_implementation != implementation);
        _version = version;
        _implementation = implementation;
        Upgraded(version, implementation);
    }
/**
 * @dev Upgrades the implementation address
 * @param version representing the version name of the new implementation to be set
 * @param implementation representing the address of the new implementation to be set
 */