vertex-edge
http://thesis.vt.edu
   http://thesis.vt.edu/thesis1.html
      http://thesis.vt.edu/thesis1/ch1

structure
http://thesis.vt.edu
   http://thesis.vt.edu/thesis1.html
      http://thesis.vt.edu/thesis1/ch2
         http://thesis.vt.edu/thesis1/ch2/secc
   http://thesis.vt.edu/thesis2/
      http://thesis.vt.edu/thesis2/ch1
         http://thesis.vt.edu/thesis2/ch2/seca

regular AND structure
http://thesis.vt.edu
   http://thesis.vt.edu/thesis2/
      http://thesis.vt.edu/thesis2/ch1
         http://thesis.vt.edu/thesis2/ch2/seca

regular OR structure
http://thesis.vt.edu
   http://thesis.vt.edu/thesis1.html
      http://thesis.vt.edu/thesis1/ch2
         http://thesis.vt.edu/thesis1/ch2/secc
   http://thesis.vt.edu/thesis2/
      http://thesis.vt.edu/thesis2/ch1
         http://thesis.vt.edu/thesis2/ch2/seca
         http://thesis.vt.edu/thesis2/ch2/secb
         http://thesis.vt.edu/thesis2/ch2/secc

veryveryverylongword
NOT FOUND