Hello, Dusty Pulver,
An other simple possibility, that does not need any plugin, would be :
Sort your file, with the native N+++ sort ( menu option Edit - Line Operations - Sort Lines Lexicographically Ascending )
Move to the beginning of your file ( CTRL + Origin )
Open the Replace dialog ( CTRL + H )
Perform the S/R, below, in Regular expression search mode :
SEARCH : (?-s)^(.*\R)\1+
REPLACE : \1
Notes :
The (?-s) modifier ensures that the dot will match standard characters, only, even if you previously checked the . matches newline option !
The \R stands for any kind of EOL character(s)
Best Regards,
guy038