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 ":".
Why
were
n't
we
?
''
Why:O
were:O
n't:O
we:O
?:O
'':O