premise: these are four students, one is writing.
hypothesis: A student is writing something.
explanation_1: Saying "a student" would imply it is one of the four students, and only one of them is writing.
premise_logic: exists p1 x1.(n_thing(x1) & exists e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_write(e1) & (x2 = x4) & n_thing(x3) & card_eq_1(x3) & n_student(x2) & card_eq_4(x2)))
hypothesis_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_write(e1) & n_thing(x2) & n_student(x1))
premise_sim: exists x1.(n_thing(x1) & exists e1 x2 x3 x4.(v_write(e1) & n_thing(x3) & n_student(x2) & card_eq_4(x2) & card_eq_1(x3) & Theme(e1,x4) & Actor(e1,x3) & (x2 = x4) & (x1 = x2)))
hypothesis_sim: exists e1 x1 x2.(v_write(e1) & n_thing(x2) & n_student(x1) & Theme(e1,x2) & Actor(e1,x1))