With no explanation, label each line with "event-attack/battle/war/militaryconflict", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
base
was
established
on
7
June
1937
as
a
base
for
the
Imperial
Japanese
Navy
Air
Service
during
the
Second
Sino-Japanese
War
.
The:O
base:O
was:O
established:O
on:O
7:O
June:O
1937:O
as:O
a:O
base:O
for:O
the:O
Imperial:organization-other
Japanese:organization-other
Navy:organization-other
Air:organization-other
Service:organization-other
during:O
the:O
Second:event-attack/battle/war/militaryconflict
Sino-Japanese:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
.:O