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 ":".
She
was
still
operating
as
a
working
tugboat
as
recently
as
May
2007
.
She:O
was:O
still:O
operating:O
as:O
a:O
working:O
tugboat:O
as:O
recently:O
as:O
May:O
2007:O
.:O