With no explanation, label each line with "location-GPE", "O", "organization-other", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
In
early
September
1939
,
Epler
took
command
of
Reserve
Center
of
20th
Infantry
at
Slonim
.
In:O
early:O
September:O
1939:O
,:O
Epler:person-other
took:O
command:O
of:O
Reserve:organization-other
Center:organization-other
of:organization-other
20th:organization-other
Infantry:organization-other
at:O
Slonim:location-GPE
.:O