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 ":".
It
was
followed
by
the
'
in
December
2009
.
It:O
was:O
followed:O
by:O
the:O
':O
in:O
December:O
2009:O
.:O