u1 {
    open u2_a
    open u2_b
    open u2_c
    open u2_d
    open u2_e
    open u2_f
    open u2_g
    open u2_h
    open u2_i
    open u2_j
    open u2_k
    open u2_l
    open u2_m
    open u2_n
    open u2_o
    open u2_p
    open u2_q
    open u2_r
    open u2_s
    open u2_t
    open u2_u
    open u2_v
    open u2_w
    open u2_x
    open u2_y
    open u2_z

    ref foo
    ref foo
}
