Section outline

  • d

    d

    f

    f

    f

    cf

    d

    c

    r

    f

    g

    f

    g


    f

    r

    f

    f

    f

    f

    d

    d

    f

    f

    f

    g

    f

    g

    f

    f

    r

    cf

    f

    dr

    d

    f

    xd

    x

    f

    f

    r