premise: A man digging dirt with a Case machine.
hypothesis: The man is at work.
explanation_1: The man might not be at work.  For instance, he could be a homeowner who has rented the machine and is using it in his own yard.
premise_logic: exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & with(e1,x4) & n_machine(x4) & of(x4,x5) & n_case(x5) & Theme(e1,x3) & Actor(e1,x2) & v_dig(e1) & n_dirt(x3) & (x1 = x2) & n_man(x1))
hypothesis_logic: exists p1 x1.(n_man(x1) & exists x2.(at(x1,x2) & n_work(x2)))
premise_sim: exists e1 x1 x2 x3 x4 x5.(with(e1,x4) & v_dig(e1) & of(x4,x5) & n_man(x1) & n_machine(x4) & n_dirt(x3) & n_case(x5) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & (x1 = x2))
hypothesis_sim: exists x1.(n_man(x1) & exists x2.(n_work(x2) & at(x1,x2)))