premise: People are river rafting.
hypothesis: People are not rafting
explanation_1: Are and are not, are the exact opposite.
premise_logic: exists e1 x1 x2.(Time(e1,x2) & n_river(x2) & Actor(e1,x1) & v_raft(e1) & n_people(x1))
hypothesis_logic: exists x1.(-exists e1.(Actor(e1,x1) & v_raft(e1)) & n_people(x1))
premise_sim: exists e1 x1 x2.(v_raft(e1) & n_river(x2) & n_people(x1) & Time(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists x1.(n_people(x1) & all e1.(-v_raft(e1) | -Actor(e1,x1)))