A man with a mallet is carving a creature out of stone.
Someone is carving plastic.
The material is either stone or plastic, not both.
exists e1 x1 x2 x3 x4.(of(e1,x4) & n_stone(x4) & r_out(e1) & Theme(e1,x3) & Actor(e1,x1) & v_carve(e1) & n_creature(x3) & with(x1,x2) & n_mallet(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_carve(e1) & n_plastic(x2) & n_person(x1))