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 ":".
Three
days
later
,
the
East
German
uprising
of
1953
occurred
.
Three:O
days:O
later:O
,:O
the:O
East:event-attack/battle/war/militaryconflict
German:event-attack/battle/war/militaryconflict
uprising:event-attack/battle/war/militaryconflict
of:O
1953:O
occurred:O
.:O