premise: Exactly six members of a skydiving team—Larue, Ohba, Pei, Trevino, Weiss, and Zacny—each dive exactly once, one at a time, from a plane, consistent with the following conditions: Trevino dives from the plane at some time before Weiss does. Larue dives from the plane either first or last. Neither Weiss nor Zacny dives from the plane last. Pei dives from the plane at some time after either Ohba or Larue but not both. Which one of the following must be true?
hypothesis: At least two of the members dive from the plane after Pei.