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 ":".
Work
on
the
Hetch
Hetchy
Project
began
in
1914
.
Work:O
on:O
the:O
Hetch:O
Hetchy:O
Project:O
began:O
in:O
1914:O
.:O