With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Commander
in
Chief
22
June
1941
:
Wilhelm
Ritter
von
Leeb
.
Commander:O
in:O
Chief:O
22:O
June:O
1941:O
::O
Wilhelm:person-other
Ritter:person-other
von:person-other
Leeb:person-other
.:O