With no explanation, label each line with "O", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Hans
Dahl
was
educated
first
to
become
an
officer
and
became
a
lieutenant
in
1871
.
Hans:person-artist/author
Dahl:person-artist/author
was:O
educated:O
first:O
to:O
become:O
an:O
officer:O
and:O
became:O
a:O
lieutenant:O
in:O
1871:O
.:O