premise: Three girls are sitting at desks and appear to be working intently.
hypothesis: Three girls are sitting in a classroom.
explanation_1: You can not infer they are in a classroom.
explanation_2: We have no idea if they are in a classroom, there are desks in many places, not just classrooms.
explanation_3: Just because they are working at desks does not mean they are in a classroom.  They could be in an office.
premise_logic: exists e1 e2 p1 x1 x2 x3.(Topic(e2,p1) & Actor(e2,x3) & v_appear(e2) & exists e3 s1.(a_intently(s1) & Manner(e3,s1) & Actor(e3,x3) & v_work(e3)) & n_girl(x3) & card_eq_3(x3) & at(e1,x2) & n_desk(x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_3(x1))
hypothesis_logic: exists e1 x1 x2.(in(e1,x2) & n_classroom(x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & card_eq_3(x1))
premise_sim: exists e1 e2 p1 x1 x2 x3.(v_sit(e1) & v_appear(e2) & n_girl(x3) & n_girl(x1) & n_desk(x2) & exists e3 s1.(v_work(e3) & a_intently(s1) & Manner(e3,s1) & Actor(e3,x3)) & card_eq_3(x3) & card_eq_3(x1) & at(e1,x2) & Topic(e2,p1) & Actor(e2,x3) & Actor(e1,x1))
hypothesis_sim: exists e1 x1 x2.(v_sit(e1) & n_girl(x1) & n_classroom(x2) & in(e1,x2) & card_eq_3(x1) & Actor(e1,x1))