Six scholars, F, G, J, L, M and N, will speak at a logical conference, which will be arranged according to the following conditions: (1) each speaker will speak only once, and there will be only one speaker at a time. (2) three speakers spoke before lunch and the other three spoke after lunch. (3) G must speak before lunch. (IV) only one speaker is between M and N. (5) F speaks in the first or third place.
If J speaks before F, the number N to speak is the fourth place.