If by "deleted" you mean that you removed them from Lightroom but they are still on your computer, you just need to import them again. If you mean that you actually deleted them from your computer then you will have to restore them from the trash if they are still there and then import them. If they are not in the trash then hopefully you still have them on the camera card. In either case they will have to be imported into Lightroom again. If this doesn't answer your question, then please provide a few details about what has happened so that we can give further advice.
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