With no explanation, label each line with "O", "location-GPE", "organization-government/governmentagency", "person-soldier", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
After
World
War
I
,
General
Erich
Ludendorff
of
the
German
High
Command
praised
the
Allied
tanks
as
being
a
principal
factor
in
Germany
's
defeat
.
After:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
I:event-attack/battle/war/militaryconflict
,:O
General:O
Erich:person-soldier
Ludendorff:person-soldier
of:O
the:O
German:location-GPE
High:O
Command:O
praised:O
the:O
Allied:O
tanks:O
as:O
being:O
a:O
principal:O
factor:O
in:O
Germany:organization-government/governmentagency
's:O
defeat:O
.:O