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3 9 5
26 1 4
268 67 78
Only one box, as that's all it needs.
It's obvious the 7 and 8 must be in the bottom row, and the 6 has to be in there too. This means the 2 must be in the middle row.
It's pretty easy to see, yet it doesn't exactly fit with any techniques I know. A sort of part-hidden-naked triplet? I don't know. The two programs I tried that show all possible moves didn't show anything there either.
So, what do we call it?