Ralph, Check out the hyperlink in my post. I provide several definitions in that hand-out. I'm attaching the PDF in case you have trouble with the link. Best regards, Daryl --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ######################################################################## To unsubscribe from the AILACTD-L list, click the following link: &*TICKET_URL(AILACTD-L,SIGNOFF);