sample/index.htm links to
la/la110001, lc/lc110001, rc/rc110001, and rt/rt110001.

File       Parent     NextLeft   NextRight  Notes
la110001   ../index   la120003   la120004   
la120003   la110001                         
la120004   la110001                         

File       Parent     NextLeft   NextRight  Notes
lc210001   ../index   lc220003   lc220004   
lc220003   lc210001                         
lc220004   lc210001                         

File       Parent     NextLeft   NextRight  Notes
rc310001   ../index   rc320003   rc320004   
rc320003   rc310001                         
rc320004   rc310001                         

File       Parent     NextLeft   NextRight  Notes
rt410001   ../index   rt420003   rt420004   
rt420003   rt410001                         
rt420004   rt410001                         
