premise: A welder is working outside by some concrete ruble
hypothesis: A person works on some concrete
explanation_1: Just because a welder is working by some concrete ruble doesn't mean he is working on some concrete
explanation_2: A person is not always a welder
explanation_3: A person can work next to concrete without necessarily working on some concrete.
premise_logic: exists e1 s1 s2 x1 x2.(by(e1,x2) & n_ruble(x2) & a_concrete(s2) & Theme(s2,x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_welder(x1))
hypothesis_logic: exists e1 x1 x2.(on(e1,x2) & n_concrete(x2) & Actor(e1,x1) & v_work(e1) & n_person(x1))