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 ":".
In
the
1920s
,
the
government
began
investigating
the
need
to
increase
the
educational
requirements
for
nurses
.
In:O
the:O
1920s:O
,:O
the:O
government:O
began:O
investigating:O
the:O
need:O
to:O
increase:O
the:O
educational:O
requirements:O
for:O
nurses:O
.:O