>> But then at some point, you are going to think to yourself - if I put the 
>> 5
>> in this box, that means a 7 must go in that box (maybe some more steps 
>> here)
>> nope that doesn't work, therefore the original 5 must go in that other 
>> box.
>> Isn't that trial and error?
>
>  No, trial and error is thinking "I don't know if the 5 goes into this
> box, but I'll put it anyways to see if it works" and then later if it
> doesn't work you erase it.

I don't see the difference between what you just said and what I said... oh 
well.

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