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
1968
,
there
were
still
25
machines
in
working
condition
,
but
they
were
retired
soon
thereafter
.
In:O
1968:O
,:O
there:O
were:O
still:O
25:O
machines:O
in:O
working:O
condition:O
,:O
but:O
they:O
were:O
retired:O
soon:O
thereafter:O
.:O