nereas
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I dive with 3 computers. The one on my wrist, the one on my buddies and the one between my ears. I really don't see the need to go beyond triple redundancy for NDL diving.
Then in reality, rather than in your pipe dream, you are diving with 1 computer, since you can easily get separated from your buddy (it happens all the time, especially in the case of diving fatalities), and you can easily get narked unless you are certified for and using trimix.
Granted the one in your head alone would work fine, for relatively shallow diving (not over 75 fsw), and fairly clear water.