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 ":".
Each
submarine
was
carrying
a
midget
submarine
.
Each:O
submarine:O
was:O
carrying:O
a:O
midget:O
submarine:O
.:O