x-line-singularity
@slide-x-line-singularity
@s5-x-line-singularity

[-- --]

@link-x-line-singularity
@site-x-line-singularity

@search-x-line-singularity

@display-x-line-singularity

@rail-x-line-singularity
shift: x / y / z


@tunnel-x-line-singularity
@plane-x-line-singularity
@crystal-x-line-singularity