5-cell killer cage summing to 31

5 digit sets sum to 31 across 5 cells. Without other constraints this cage is loose; the value comes from pairing it with the cage's row, column, or box context — every digit ruled out elsewhere narrows which combinations remain.

Locked digits: 9. Whichever combination is in play, this digit sit somewhere inside the cage — meaning the cage's shared row, column, and box can't have it anywhere outside the cage.