With no explanation, label each line with "location-GPE", "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
main
defence
on
the
islands
was
Fort
Belgica
which
is
a
fairly
significant
position
built
in
the
stereotypical
Vauban
pentagon
and
surrounded
by
a
ditch
.
The:O
main:O
defence:O
on:O
the:O
islands:O
was:O
Fort:building-other
Belgica:building-other
which:O
is:O
a:O
fairly:O
significant:O
position:O
built:O
in:O
the:O
stereotypical:O
Vauban:location-GPE
pentagon:O
and:O
surrounded:O
by:O
a:O
ditch:O
.:O