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
M.