Never thought about it but considering they are COW snaps I'm guessing the best way is to delete the oldest first as that should result in absolutely no consolidations of the snapshots.
If you had 3 snaps and deleted the middle one, then the 3PAR would have to consolidate that snapshot into the newest one to ensure you only had one (and the correct) version of each block that had changed (assuming the same block was touched in both snaps).
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