An old woman is knitting with blue yarn.
A teenager knits a scarf.
An old woman cannot be a teenager.
exists e1 s1 s2 x1 x2.(with(e1,x2) & n_yarn(x2) & a_blue(s2) & Theme(s2,x2) & Actor(e1,x1) & v_knit(e1) & n_woman(x1) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_knit(e1) & n_scarf(x2) & n_teenager(x1))