With no explanation, label each line with "O", "event-protest", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
On
22
April
2002
,
following
the
11
September
2001
attacks
,
9
MWCS-28
Marines
deployed
in
support
of
Operation
ENDURING
FREEDOM
(
OEF
)
.
On:O
22:O
April:O
2002:O
,:O
following:O
the:O
11:O
September:O
2001:O
attacks:O
,:O
9:O
MWCS-28:organization-other
Marines:organization-other
deployed:O
in:O
support:O
of:O
Operation:event-protest
ENDURING:event-protest
FREEDOM:event-protest
(:O
OEF:event-protest
):O
.:O