All, My code is not perfect, but the error I was noticing in trying to step through the algorithm using the verbs f and diff were correct, BUT my initial data in the noun raw was missing a starting SPACE. So the example data was unsolvable. When I corrected the data, I was able to get an answer with Mike's most recent verb 'solve', and it looks like it is the correct answer.
I apologize for the noise. And will try to improve my solution now; for some reason my version of 'sudoku' is flawed, but I think I can rectify that now that I have a working version of the verbs f and diff. Again, I apologize. And thank you. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
