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 ":".
He
could
,
however
,
watch
the
news
,
because
no
significant
action
occurred
.
He:O
could:O
,:O
however:O
,:O
watch:O
the:O
news:O
,:O
because:O
no:O
significant:O
action:O
occurred:O
.:O