With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
However
,
the
Germans
managed
to
break
through
the
Polish
defences
and
Sadowski
ordered
his
men
to
retreat
behind
the
Przemsza
.
However:O
,:O
the:O
Germans:O
managed:O
to:O
break:O
through:O
the:O
Polish:location-GPE
defences:O
and:O
Sadowski:location-GPE
ordered:O
his:O
men:O
to:O
retreat:O
behind:O
the:O
Przemsza:location-GPE
.:O