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 ":".
While
this
train
is
underway
,
the
other
train
is
being
loaded
.
While:O
this:O
train:O
is:O
underway:O
,:O
the:O
other:O
train:O
is:O
being:O
loaded:O
.:O