If you look closely at any keyboard you will find that "M" and "N" are in juxtaposition and are quite frequently and accidentally interchanged in what is commonly called a "typo".
Thank you so much for bringing this error to my attention.
However the general thrust of my post has not,I feel, been denigrated by this faux pas.
Feel free, however, in your seeming prolific moments of sheer perpetual boredom to bring these aberrations to my attention.