An employee is vacuuming a building model.
There is someone vacuuming.
Both subjects are vacuuming
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_vacuum(e1) & n_model(x2) & of(x2,x3) & n_building(x3) & n_employee(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_vacuum(e1) & (x2 = x3) & n_person(x2))