premise: Three people sitting on some stairs laughing.
hypothesis: There are three people.
explanation_1: If there are three people there are people
explanation_2: There's are three people as per both the sentences.
explanation_3: Three people are sitting on the stairs, so there are three people.
premise_logic: exists e2 e1 x1 x2 x3.(a_topic(x1) & for(e1,e2) & Actor(e2,x2) & v_laugh(e2) & on(e1,x3) & n_stair(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
hypothesis_logic: exists p1 x1 x2.((x1 = x2) & n_people(x2) & card_eq_3(x2))
premise_sim: exists e2 e1 x1 x2 x3.(v_sit(e1) & v_laugh(e2) & on(e1,x3) & n_stair(x3) & n_people(x1) & for(e1,e2) & card_eq_3(x1) & a_topic(x1) & Actor(e2,x2) & Actor(e1,x2) & (x1 = x2))
hypothesis_sim: exists x1 x2.(n_people(x2) & card_eq_3(x2) & (x1 = x2))