A dozen workers wearing uniforms  & sanitation hats are working on an assembly line in a factory.
There are some people doing quality control checks on an assembly line.
Working on an assembly line does not mean doing quality control checks.
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 p1 x1 e1 x2 x3 x4 x5 x6 x7 x8.((x1 = x2) & on(e1,x7) & n_line(x7) & of(x7,x8) & n_assembly(x8) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_check(x4) & of(x4,x6) & n_control(x6) & of(x4,x5) & n_quality(x5) & (x2 = x3) & n_people(x2))