New to Applescript - Need script to delete unwanted text

Scripting Forums AppleScript | Mac OS X
#1

I have a large text file and need to delete certain names from the file. For example, one item has 20 descriptions for it and I only need it to have 3. The file is large and need it to be automated as easily as possible. Can anyone help?

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Operating System: Mac OS X (10.3.9)

#2

I think we need an instance.