Using "can not" in place of cannot? Or there's a reason and a rhyme to use one Vs the other?
Cannot is more common, but the accent is on the first syllable, "can", so if I wanted to emphasize the "not", I might separate the words:
In NY you can, but in NJ you can not.
Making this up as I go along, and now I'm not sure. I would probably rewrite it:
In NY you can, but not in NJ.
But I would definitely separate them in:
No! I said you can NOT have that last bit of chocolate ice cream!