In the following series, count each N which is immediately followed by X but X is
not immediately followed by T. How many such N's are there ?
N X N T Q M N X T M X N X C N Q M N N X Q N X T X N A M X N X MN [X] N T Q M N X T M X [N ] X C N Q M
N [N] X Q N X T X N A M X [N] X M
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