G, H, J, K, L, M and O travel together  During their four-day camping life, two people were arranged to be on duty to cook for everyone every day  The arrangement of the personnel required for these four days cannot be repeated, and there happens to be one person on duty for two days In addition, the following conditions must be met for those on duty: (1)J is arranged to be on duty the day after H (2) the person who is on duty for two days must be on the fourth day, not the third day  (3) G must be arranged on the same day as one of J and O  (4) K is arranged to be on duty on at least one day on the first or second day
(5) O must be on the third day
H and M.