Is the graph G = (V, E) is planar or nonplanar

a)

V={a, b, c, d, e, f, g, h}

E={ab, ad, af, ah, bc, be, bg, cd, cf, de, ef, eh, f g, gh}

b)

V={u, v, w, x, y, z}

E={uv, ux, uy, uz, vw, vx, vy, vz, wx, wz, xy, xz, yz}