With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
1920
,
Baum
entered
the
engineering
contracting
business
.
In:O
1920:O
,:O
Baum:person-other
entered:O
the:O
engineering:O
contracting:O
business:O
.:O