With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
They
became
the
first
of
the
``
Geschwader
``
casualties
;
all
were
taken
prisoner
of
war
.
They:O
became:O
the:O
first:O
of:O
the:O
``:O
Geschwader:product-weapon
``:O
casualties:O
;:O
all:O
were:O
taken:O
prisoner:O
of:O
war:O
.:O