A dozen workers wearing uniforms  & sanitation hats are working on an assembly line in a factory.
A group of people are assembling the new iphones in a factory
Working on an assembly line does not mean assembling the new iphones.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(in(e2,x9) & n_factory(x9) & on(e2,x7) & n_line(x7) & of(x7,x8) & n_assembly(x8) & Actor(e2,x1) & v_work(e2) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & n_hat(x4) & of(x4,x6) & n_sanitation(x6) & ne_org_&(x4) & of(x4,x5) & n_uniform(x5) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_dozen(x2))
exists e1 s1 x1 x2 x3 x4.(n_iphone(x3) & a_new(s1) & Theme(s1,x3) & Theme(e1,x3) & Actor(e1,x1) & v_assemble(e1) & in(x3,x4) & n_factory(x4) & of(x1,x2) & n_people(x2) & n_group(x1))