Do these frames serve a purpose? Ben said we should keep them while we add the frames that we do want because they help us. What happens if we don’t keep them?
It’s because, if you delete the frames which are already there, you might delete the entire curve, I don’t think that ever happened to me though, but, to be on the safe side, keep the 2 default ones until you paste your own ones in 
They are added by default just to create the start and end of the curve.
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That makes sense, thanks a lot!