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here another variant
similar to quadruple, here the two candidates, shown at the intersections of cells, indicates that the number is NOT present in the 4 adjacent cells.
i.e.: number 7 in second box is only possible in cell r3c6
let me know what you think about it

tha double exclusion is quite easy to solve (at least level 0 to 2), but it is time consuming.

here the single exclusion, certainly faster to solve