With no explanation, label each line with "product-airplane", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
Three
Hawker
Osprey
aircraft
first
touched
down
in
the
Kallang
Airport
around
two
years
before
its
official
opening
,
on
21
November
1935
.
Three:O
Hawker:product-airplane
Osprey:product-airplane
aircraft:O
first:O
touched:O
down:O
in:O
the:O
Kallang:building-airport
Airport:building-airport
around:O
two:O
years:O
before:O
its:O
official:O
opening:O
,:O
on:O
21:O
November:O
1935:O
.:O