Hi, I would set this up by drawing six lines in a circle. I would note that PN are a block, although they are reversible, that L must be next to one or more of M and N, K and M are not adjacent, and that if OP than not OM.
For this question, we know that we have a block of LKP or PKL. Since we know that P is next to N, we know our block is now LKPN or NPKL, since we know that L must be next to M or N, and we know that N is not next to L, we know that it is next to M, so our block is now MLKPN or NPKLM. So, we know that O is our last one to place, so our final order is OMLKPN or NPKLMO. Since this is the order they sit around the table, we know that M is between L and O.
