premise: Seven men are preparing to operate a helicopter
hypothesis: Two instructors are teaching a small class of five how to fly a helicopter.
explanation_1: Not all small class have five students and two instructors.
explanation_2: Seven men are preparing to operate a helicopter doesn't imply that a a small class of five  are learning how to fly a helicopter.
explanation_3: Just because seven men are preparing to operate a helicopter, doesn't mean two instructors are teaching a small class.
premise_logic: exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_operate(e2) & n_helicopter(x3)) & n_man(x1) & (x1 = x2) & ne_nam_seven(x2))
hypothesis_logic: exists e1 p1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & of(x2,x3) & Topic(x3,p1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x3) & v_fly(e2) & n_helicopter(x4)) & n_thing(x3) & card_eq_5(x3) & n_class(x2) & a_small(s1) & Theme(s1,x2) & n_instructor(x1) & card_eq_2(x1))
premise_sim: exists e1 p1 x1 x2.(v_prepare(e1) & ne_nam_seven(x2) & n_man(x1) & exists e2 x3.(v_operate(e2) & n_helicopter(x3) & Theme(e2,x3) & Actor(e2,x1)) & Topic(e1,p1) & Actor(e1,x1) & (x1 = x2))
hypothesis_sim: exists e1 p1 s1 x1 x2 x3.(v_teach(e1) & of(x2,x3) & n_thing(x3) & n_instructor(x1) & n_class(x2) & exists e2 x4.(v_fly(e2) & n_helicopter(x4) & Theme(e2,x4) & Actor(e2,x3)) & card_eq_5(x3) & card_eq_2(x1) & a_small(s1) & Topic(x3,p1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1))