[dag]
a->b
a->c
b->d
c->f
c->g
a->f
d->da
d->db
g->gg
b->gg
b->f
c->da
z->g


a:Home Page
b:Main Section 1
c:Main Section 2
d:Subsection 1
f:Subsection 2
g:Subsection 3
da:Sub-sub
db:Sub-sub
gg:#page#

z: Another Entrance