With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
April
1944
,
he
formed
the
91st
Infantry
Division
.
In:O
April:O
1944:O
,:O
he:O
formed:O
the:O
91st:organization-other
Infantry:organization-other
Division:organization-other
.:O