**********************************************************  
 Time Of Error            : 2/8/2020 10:23:47 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type               : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 10:40:42 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 10:50:42 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 10:55:57 AM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:03:41 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:05:57 AM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:10:52 AM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:13:03 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:27:29 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:36:32 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:49:30 AM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 11:51:58 AM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:04:09 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:06:49 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:15:26 PM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:17:35 PM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:27:34 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 12:32:31 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 1:03:20 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 1:10:23 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 2:00:44 PM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 3:35:12 PM
 Error Message            : The remote server returned an error: (400) Bad Request.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 5:03:10 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 5:56:19 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 5:57:55 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 6:18:27 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)


  **********************************************************  
 Time Of Error            : 2/8/2020 6:35:37 PM
 Error Message            : The remote server returned an error: (500) Internal Server Error.
 Error Place              :    at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadData(Uri address, String method, Byte[] data)
   at System.Net.WebClient.UploadData(String address, String method, Byte[] data)
   at Design_FrontOffice_OPDAppointment.SendAppointmentDetails(String transaction_ID) in e:\Production\Mayom\Design\FrontOffice\OPDAppointment.aspx.cs:line 3542
 Error On Machine         : RGCIPAC3
 Error Machine IP Address : fe80::c95f:f286:383d:ff9f%12
 Exception Type           : System.Net.WebException
 TargetSite               : Byte[] UploadDataInternal(System.Uri, System.String, Byte[], System.Net.WebRequest ByRef)