FirebaseEmailAuthUI/Sources/FUIConfirmEmailViewController.m [151:168]:
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  void (^completeSignInBlock)(FIRAuthDataResult *, NSError *) = ^(FIRAuthDataResult *authResult,
                                                                  NSError *error) {
    [self decrementActivity];

    if (error) {
      switch (error.code) {
        case FIRAuthErrorCodeWrongPassword:
          [self showAlertWithMessage:FUILocalizedString(kStr_WrongPasswordError)];
          return;
        case FIRAuthErrorCodeUserNotFound:
          [self showAlertWithMessage:FUILocalizedString(kStr_UserNotFoundError)];
          return;
        case FIRAuthErrorCodeUserDisabled:
          [self showAlertWithMessage:FUILocalizedString(kStr_AccountDisabledError)];
          return;
        case FIRAuthErrorCodeTooManyRequests:
          [self showAlertWithMessage:FUILocalizedString(kStr_SignInTooManyTimesError)];
          return;
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FirebaseEmailAuthUI/Sources/FUIPasswordSignInViewController.m [155:172]:
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    void (^completeSignInBlock)(FIRAuthDataResult *, NSError *) = ^(FIRAuthDataResult *authResult,
                                                                    NSError *error) {
      [self decrementActivity];

      if (error) {
        switch (error.code) {
          case FIRAuthErrorCodeWrongPassword:
            [self showAlertWithMessage:FUILocalizedString(kStr_WrongPasswordError)];
            return;
          case FIRAuthErrorCodeUserNotFound:
            [self showAlertWithMessage:FUILocalizedString(kStr_UserNotFoundError)];
            return;
          case FIRAuthErrorCodeUserDisabled:
            [self showAlertWithMessage:FUILocalizedString(kStr_AccountDisabledError)];
            return;
          case FIRAuthErrorCodeTooManyRequests:
            [self showAlertWithMessage:FUILocalizedString(kStr_SignInTooManyTimesError)];
            return;
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