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 ":".
The
typical
service
pattern
consists
of
either
one
or
two
trains
an
hour
,
depending
on
the
day
and
time
of
day
,
with
each
train
taking
20
minutes
for
its
journey
.
The:O
typical:O
service:O
pattern:O
consists:O
of:O
either:O
one:O
or:O
two:O
trains:O
an:O
hour:O
,:O
depending:O
on:O
the:O
day:O
and:O
time:O
of:O
day:O
,:O
with:O
each:O
train:O
taking:O
20:O
minutes:O
for:O
its:O
journey:O
.:O