premise: A old man and a youth work on starting a tiller.
hypothesis: A tiller is being used
explanation_1: Tiller being used is only a short sentence and a consequence of sentence 1 where the old man and youth work on a tiller.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x5) & Actor(e1,x4) & v_start(e1) & n_tiller(x5) & (x2 = x4) & n_work(x2) & of(x2,x3) & n_youth(x3) & subset_of(x1,s1) & n_man(x1) & a_old(s2) & Theme(s2,x1))
hypothesis_logic: exists e1 x1.(Theme(e1,x1) & v_use(e1) & n_tiller(x1))
premise_sim: exists e1 s1 s2 x1 x2 x3 x4 x5.(v_start(e1) & subset_of(x2,s1) & subset_of(x1,s1) & of(x2,x3) & n_youth(x3) & n_work(x2) & n_tiller(x5) & n_man(x1) & a_topic(s1) & a_old(s2) & Theme(s2,x1) & Theme(e1,x5) & Actor(e1,x4) & (x2 = x4))
hypothesis_sim: exists e1 x1.(v_use(e1) & n_tiller(x1) & Theme(e1,x1))