With no explanation, label each line with "organization-other", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
preparation
for
Operation
Barbarossa
,
Army
Group
North
was
reformed
from
Army
Group
C
on
22
June
1941
.
In:O
preparation:O
for:O
Operation:event-attack/battle/war/militaryconflict
Barbarossa:event-attack/battle/war/militaryconflict
,:O
Army:organization-other
Group:organization-other
North:organization-other
was:O
reformed:O
from:O
Army:organization-other
Group:organization-other
C:organization-other
on:O
22:O
June:O
1941:O
.:O