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
passed
at
a
distance
of
approximately
on
February
15
,
2011
,
04:42
UTC
.
It:O
passed:O
at:O
a:O
distance:O
of:O
approximately:O
on:O
February:O
15:O
,:O
2011:O
,:O
04:42:O
UTC:O
.:O