1 dx

1 dx1 dx1 dx1 dx
1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx
1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx
1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx
1 dx1 dx1 dx1 dx1 dx1 dx1 dx1 dx