My first models used an approach like Walter and mdijkens eliminating numbers available starting by listing all 9 in cell.
But after you play that system for awhile you learn "too many numbers ie too much information" when it comes to narrowing the cell down to only one or two, maximally 3 choices is best ie note the numbers yourself. I use right clicking for notes, if i click number again in notes, it is removed.
I suspect Walter more concerned with look of the thing than playing on master level, see all the yak about bubbles
He is probably more likely designing an icon logo than testing the practical use of 9 numbers in cell.
But after you play that system for awhile you learn "too many numbers ie too much information" when it comes to narrowing the cell down to only one or two, maximally 3 choices is best ie note the numbers yourself. I use right clicking for notes, if i click number again in notes, it is removed.
I suspect Walter more concerned with look of the thing than playing on master level, see all the yak about bubbles
He is probably more likely designing an icon logo than testing the practical use of 9 numbers in cell.
b = b + ...