premise: A young boy reaches for and touches the propeller of a vintage aircraft.
hypothesis: A young boy swims in his pool.
explanation_1: A boy touches the propeller of an aircraft can not do so while he swims in his pool.
explanation_2: The first sentence is about a boy who touches something old.  The second sentence is about a boy who swims in a pool. Unless there are pools full of vintage aircraft's, these two boys are not one in the same.
explanation_3: The boy cannot be swimming if he is touching an airplane propeller.
premise_logic: exists e2 e1 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6.(n_propeller(x5) & n_propeller(x2) & Theme(e2,x5) & Actor(e2,x4) & v_touch(e2) & of(x5,x6) & n_aircraft(x6) & a_vintage(s4) & Theme(s4,x6) & n_boy(x4) & a_young(s3) & Theme(s3,x4) & for(e1,x2) & of(x2,x3) & n_aircraft(x3) & a_vintage(s2) & Theme(s2,x3) & Actor(e1,x1) & v_reach(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
hypothesis_logic: exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_pool(x3) & of(x3,x1) & n_male(x1) & n_swim(x1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))