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 ":".
Though
cultivated
in
some
regions
,
the
plant
is
elsewhere
considered
a
weed
.
Though:O
cultivated:O
in:O
some:O
regions:O
,:O
the:O
plant:O
is:O
elsewhere:O
considered:O
a:O
weed:O
.:O