Eight persons K, L, M, N, O, P, Q, and R are seated in a row. Some face north, others face south. The following conditions apply: N sits fifth to the ...

Eight persons K, L, M, N, O, P, Q, and R are seated in a row. Some face north, others face south. The following conditions apply:

• N sits fifth to the right of M, and neither sits at an extreme end.
• Q sits third to the right of N.
• L sits second to the right of Q.
• Exactly one person sits between L and P.
• R sits third to the left of P.
• K sits second to the left of O.
• The persons at the extreme ends face opposite directions.
• Both immediate neighbors of M face the same direction.
• R sits to the left of L, and both face opposite directions.
• R does not face north.

Question: Four of the following persons are alike in a certain way and form a group. Which one does NOT belong to that group?