With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
2001
:
Following
the
9/11
attacks
the
centre
provided
psychological
support
and
counselling
to
civilians
who
were
affected
.
2001:O
::O
Following:O
the:event-attack/battle/war/militaryconflict
9/11:event-attack/battle/war/militaryconflict
attacks:event-attack/battle/war/militaryconflict
the:O
centre:O
provided:O
psychological:O
support:O
and:O
counselling:O
to:O
civilians:O
who:O
were:O
affected:O
.:O