Hi, Ev -

Your reasoning overlooks the fact that there are no restrictions on N's location except that it comes after P and is not last. More particularly, it can come after P but before J. If we diagram out the known restrictions of the problem, we get something like the following:

L - P - - J - - O - - K - - M
| | | |
N N N N

In other words, the relative order of L, P, J, O, K, and M is determined, but N can go in any position except before L, between L and P, or after M (last). Thus the only items whose positions can be determined absolutely are L, P and M.

Please feel free to post again if you still have questions.

Best,
Lyn