With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Various
plans
were
considered
to
reduce
congestion
including
a
high-level
bridge
and
a
bridge
further
upstream
,
leaving
the
existing
bridge
for
local
traffic
;
however
none
were
enacted
until
after
World
War
II
.
Various:O
plans:O
were:O
considered:O
to:O
reduce:O
congestion:O
including:O
a:O
high-level:O
bridge:O
and:O
a:O
bridge:O
further:O
upstream:O
,:O
leaving:O
the:O
existing:O
bridge:O
for:O
local:O
traffic:O
;:O
however:O
none:O
were:O
enacted:O
until:O
after:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
.:O