With no explanation, label each line with "O", "other-law", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
With
his
death
,
one
of
the
major
obstacles
to
peace
was
gone
and
the
Treaty
of
Oliva
was
signed
on
23
April
.
With:O
his:O
death:O
,:O
one:O
of:O
the:O
major:O
obstacles:O
to:O
peace:O
was:O
gone:O
and:O
the:O
Treaty:other-law
of:other-law
Oliva:other-law
was:O
signed:O
on:O
23:O
April:O
.:O