abstract contract ERC20PausableUpgradeable is
  Initializable,
  ERC20Upgradeable,
  PausableUpgradeable
{
  function __ERC20Pausable_init() internal initializer {
    __Context_init_unchained();
    __Pausable_init_unchained();
    __ERC20Pausable_init_unchained();
  }

  function __ERC20Pausable_init_unchained() internal initializer {}

  /**
   * @dev See {ERC20-_beforeTokenTransfer}.
   *
   * Requirements:
   *
   * - the contract must not be paused.
   */
  function _beforeTokenTransfer(
    address from,
    address to,
    uint256 amount
  ) internal virtual override {
    super._beforeTokenTransfer(from, to, amount);

    require(!paused(), "ERC20Pausable: token transfer while paused");
  }

  uint256[50] private __gap;
}
/**
 * @dev ERC20 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
function _beforeTokenTransfer(
  address from,
  address to,
  uint256 amount
) internal virtual override {
  super._beforeTokenTransfer(from, to, amount);

  require(!paused(), "ERC20Pausable: token transfer while paused");
}

/**
 * @dev See {ERC20-_beforeTokenTransfer}.
 *
 * Requirements:
 *
 * - the contract must not be paused.
 */