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 ":".
During
the
Iran-Iraq
War
his
son
-
who
was
only
14
years
old
-
died
a
martyr
,
having
been
killed
by
Iraqi
troops
.
During:O
the:O
Iran-Iraq:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
his:O
son:O
-:O
who:O
was:O
only:O
14:O
years:O
old:O
-:O
died:O
a:O
martyr:O
,:O
having:O
been:O
killed:O
by:O
Iraqi:O
troops:O
.:O