The wood used for the seat portion of the bench is comprised of different colored slats.
The bench is plastic.
Wood and plastic are two different materials.
exists e4 e3 e2 e1 x1 x2 x3 x4 x5 x6 x7.(n_slat(x7) & Theme(e4,x7) & v_color(e4) & n_bench(x5) & n_portion(x3) & of(x3,x4) & n_seat(x4) & n_wood(x1) & of(e2,x6) & -(x6 = x7) & n_slat(x6) & Theme(e3,x6) & v_color(e3) & Theme(e2,x1) & v_comprise(e2) & for(e1,x3) & of(x3,x5) & Theme(e1,x2) & v_use(e1) & (x1 = x2))
exists p1 x1.(n_bench(x1) & exists x2.((x1 = x2) & n_plastic(x2)))