It seems that the shows on Nick at Nite aired before on TBS like

The Brady Bunch
Three's Company
The Jeffersons
Family Ties
The Cosby Show
Gigland's Island

Don't forget Laverne Shirley, Andy Griffith and Beverly Hillbillies.

It seems like this is how it goes:

First: ABC/CBS/NBC
Second: Syndication
Third: TBS
Fourth: Nick At Nite
Fifth: TNN

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Andrew Carden