"Cannot" or "Can Not"? - Grammar Monster
https://www.grammar-monster.com/easily_confused/can_not_cannot.htm
WEBCannot or Can Not? What Is the Difference between "Cannot" and "Can Not"? "Cannot" and "can not" are both acceptable expansions of "can't." However, in most circumstances, you should use "cannot" (i.e., the one-word version). "Cannot" (one word) is the most common expansion of the contraction "can't." For example: I cannot do it!
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