With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Sadr
and
Chamran
had
an
important
role
in
the
Islamic
Revolution
of
Iran
.
Sadr:person-other
and:O
Chamran:person-other
had:O
an:O
important:O
role:O
in:O
the:O
Islamic:event-attack/battle/war/militaryconflict
Revolution:event-attack/battle/war/militaryconflict
of:event-attack/battle/war/militaryconflict
Iran:event-attack/battle/war/militaryconflict
.:O