A man in a blue-plaid shirt and white hat, backdropped by a stone wall performs an unknown task while standing atop a platform.
The man is cooking dinner.
Cooking dinner is an identified task, not an unknown task.
exists e1 e3 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8 x9.(while(e2,e3) & atop(e3,x9) & n_platform(x9) & Actor(e3,x1) & v_stand(e3) & Theme(e2,x8) & Actor(e2,x1) & v_perform(e2) & n_task(x8) & a_unknown(s3) & Theme(s3,x8) & Actor(e1,x6) & n_wall(x6) & of(x6,x7) & n_stone(x7) & Theme(e1,x5) & v_backdrop(e1) & (x1 = x5) & in(x1,x2) & n_hat(x4) & a_white(s2) & Theme(s2,x4) & n_shirt(x3) & a_blue-plaid(s1) & Theme(s1,x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_dinner(x2) & a_cooking(s1) & Theme(s1,x2)))