Newsletter - Additional Subscriber Information

I have a client who want to add additional subscriber information to the Newsletter such as Firstname, surname, prefix, organization.  My client also wants to use the prefix, firstname and surname in the content of the newsletter.  For example, Dear #firstname# would the contents of the variable.

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Ragi Sekaly

Northernpenguin

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northernpenguin
Northern Penguin Technologies

"Any sufficiently advanced technology
is indistinguishable from magic."
........Arthur C. Clarke