With no explanation, label each line with "person-politician", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
During
World
War
II
,
Urawa
was
bombed
twice
by
Allied
forces
in
April
and
May
1945
.
During:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
,:O
Urawa:person-politician
was:O
bombed:O
twice:O
by:O
Allied:O
forces:O
in:O
April:O
and:O
May:O
1945:O
.:O