I was doing a super sudoku, and I had this group in 3 boxes, and I wanted to double check to make sure they are exclusively in those 3 boxes.

In a 4x4 box, the bottom 4 boxes:

-----Box 1-|----Box 2 |---Box 3 |----Box 4

------59---|------0---|---589---|-----89

If those 3 were in those boxes like that, does that mean, that no matter what, Box 1, Box 3 and Box 4, will be some combo of "5 or 8 or 9", to the extent, that I can remove any 5's, 8's and 9's from the rest of the row, and the rest of the box??

Cause I tested,

If Box 1 is 5, then the other two are 8 and 9 or if Box 1 is 9, then Box 3 would be 5 and Box 4 would be 8

If Box 3 is 5, then Box 1 is 9 and Box 4 is 8 or if Box 3 is 8, then Box 4 is 9 and Box 1 is 5 or if Box 3 is 9, then Box 1 is 5, and Box 4 is 8

If Box 4 is 8, then Box 1 is 59 and Box 3 is 59 or if Box 4 is 9, then Box 1 is 5 and Box 3 is 8

In every scenario, 1 of each of the boxes was either 5, 8 and 9. But I just wanted to make sure this qualified to remove all other 5, 8 and 9's from the row and the 4x4 Box.