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
is
a
vigorous
biennial
plant
with
coarse
,
spiny
leaves
and
conspicuous
spiny-winged
stems
.
It:O
is:O
a:O
vigorous:O
biennial:O
plant:O
with:O
coarse:O
,:O
spiny:O
leaves:O
and:O
conspicuous:O
spiny-winged:O
stems:O
.:O