A group traveling to Tibet, besides Lhasa, there are six cities or scenic spots to choose from: E City, F City, G Lake, H mountain, I peak, J Lake  Considering such factors as time, funds, plateau environment and personnel's physical condition, (1) at least one of G lake and J Lake should be visited  (2) If you don't go to E city or F city, you can't go to G Lake  (3) If you don't go to E city, you can't go to H Mountain
(4) Lake J can be reached only after crossing peak I
The group went to E City and Lake J