With no explanation, label each line with "location-GPE", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
KG
54
's
attack
on
Rotterdam
in
May
1940
has
occasioned
accusations
of
war
crimes
but
no
criminal
charges
were
ever
filed
against
the
wing
's
officers
or
any
senior
officer
commander
at
corps
or
air
fleet
level
.
KG:product-weapon
54:product-weapon
's:O
attack:O
on:O
Rotterdam:location-GPE
in:O
May:O
1940:O
has:O
occasioned:O
accusations:O
of:O
war:O
crimes:O
but:O
no:O
criminal:O
charges:O
were:O
ever:O
filed:O
against:O
the:O
wing:O
's:O
officers:O
or:O
any:O
senior:O
officer:O
commander:O
at:O
corps:O
or:O
air:O
fleet:O
level:O
.:O