The keyboard is white
There is a computing accesory.
Not all keyboards are a computing accesory.
exists s1 x1.(n_keyboard(x1) & Theme(s1,x1) & a_white(s1))
exists p1 x1 x2 x3.((x1 = x2) & n_accesory(x2) & of(x2,x3) & n_computing(x3))