premise: A person waterskiing in a river with a large wall in the background.
hypothesis: A person waterskiing in a river with a wall in the background.
explanation_1: A person is in front of a wall, be in large or not.
explanation_2: A person is waterskiing near a large wall near the river.
explanation_3: The only difference between these sentences in the word " large ".
premise_logic: exists s1 x1 x2 x3 x4 x5.(n_background(x5) & a_topic(x1) & in(x1,x3) & with(x3,x4) & in(x4,x5) & n_wall(x4) & a_large(s1) & Theme(s1,x4) & n_river(x3) & Time(x1,x2) & n_waterskiing(x2) & n_person(x1))
hypothesis_logic: exists x1 x2 x3 x4 x5.(n_background(x5) & a_topic(x1) & in(x1,x3) & with(x3,x4) & in(x4,x5) & n_wall(x4) & n_river(x3) & Time(x1,x2) & n_waterskiing(x2) & n_person(x1))