With no explanation, label each line with "event-attack/battle/war/militaryconflict", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
force
known
as
``
Army
Group
Centre
``
at
the
start
of
the
Soviet
Vistula-Oder
Offensive
on
12
January
1945
was
renamed
``
Army
Group
North
``
less
than
two
weeks
after
the
offensive
commenced
.
The:O
force:O
known:O
as:O
``:O
Army:organization-other
Group:organization-other
Centre:organization-other
``:O
at:O
the:O
start:O
of:O
the:O
Soviet:event-attack/battle/war/militaryconflict
Vistula-Oder:event-attack/battle/war/militaryconflict
Offensive:event-attack/battle/war/militaryconflict
on:O
12:O
January:O
1945:O
was:O
renamed:O
``:O
Army:organization-other
Group:organization-other
North:organization-other
``:O
less:O
than:O
two:O
weeks:O
after:O
the:O
offensive:O
commenced:O
.:O