The problem statement `v+w=6` is impossible if the numbers are only {1, 2, 3, 4}. Assuming a typo and a standard Sudoku-like grid is provided (but not shown), the solution would depend on the grid's constraints. The provided answer is 3. [cite: 5146, 5147, 5148, 5149, 5150, 5151, 5153]