A sculptor applies his chisel to a slab of rock, etching a pattern on its surface.
The sculptor is working with clay.
A sculptor that applies his chisel to a slab of rock cannot be working with clay at the same time.
exists e2 e1 x1 x2 x3 x4 x5 x6.(for(e1,e2) & Theme(e2,x5) & Actor(e2,x1) & v_etch(e2) & on(x5,x6) & n_surface(x6) & of(x6,x1) & n_thing(x1) & n_pattern(x5) & to(e1,x3) & of(x3,x4) & n_rock(x4) & n_slab(x3) & Theme(e1,x2) & Actor(e1,x1) & v_apply(e1) & n_chisel(x2) & of(x2,x1) & n_male(x1) & n_sculptor(x1))
exists e1 x1 x2.(n_sculptor(x1) & with(e1,x2) & n_clay(x2) & Actor(e1,x1) & v_work(e1))