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 ":".
The
squadron
flew
the
Handley
Page
Halifax
Mk
.
The:O
squadron:O
flew:O
the:O
Handley:O
Page:O
Halifax:O
Mk:O
.:O