premise: A person is hanging on to the bottom of an airplane preparing to skydive.
hypothesis: A person is skydiving alone
explanation_1: Because another person is not visible, doesn't mean the skydiver is alone.
explanation_2: The person does not have to be skydiving alone.
explanation_3: Just because a person is hanging on to the bottom of an airplane  preparing to skydive, doesn't mean  they are alone..
premise_logic: exists e2 e1 p1 x1 x2 x3 x4.(n_bottom(x2) & r_on(e1) & to(e1,x2) & of(x2,x3) & Topic(e2,p1) & Actor(e2,x4) & v_prepare(e2) & exists e3.(Actor(e3,x4) & v_skydive(e3)) & (x3 = x4) & n_airplane(x3) & Actor(e1,x1) & v_hang(e1) & n_person(x1))
hypothesis_logic: exists e1 s1 x1.(a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_skydive(e1) & n_person(x1))