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 ":".
But
they
did
n't
laugh
.
''
But:O
they:O
did:O
n't:O
laugh:O
.:O
'':O