With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
In
the
past
,
families
were
large
with
up
to
twelve
children
but
in
the
20th
century
,
family
planning
campaigns
have
brought
that
average
down
to
5.6
.
In:O
the:O
past:O
,:O
families:O
were:O
large:O
with:O
up:O
to:O
twelve:O
children:O
but:O
in:O
the:O
20th:O
century:O
,:O
family:O
planning:O
campaigns:O
have:O
brought:O
that:O
average:O
down:O
to:O
5.6:O
.:O