1 s b x

1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x1 s b x