With no explanation, label each line with "O", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
was
then
hastened
after
the
US
and
USSR
began
working
on
a
test
ban
and
possible
disarmament
agreements
which
would
begin
to
take
effect
in
1958
.
This:O
was:O
then:O
hastened:O
after:O
the:O
US:organization-government/governmentagency
and:O
USSR:organization-government/governmentagency
began:O
working:O
on:O
a:O
test:O
ban:O
and:O
possible:O
disarmament:O
agreements:O
which:O
would:O
begin:O
to:O
take:O
effect:O
in:O
1958:O
.:O