With no explanation, label each line with "product-other", "building-other", "O", "location-GPE", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
A
VC
rocket
and
mortar
attack
on
Tan
Son
Nhut
Air
Base
killed
four
U.S
.
personnel
and
wounded
21
and
damaged
base
buildings
.
A:O
VC:product-other
rocket:product-other
and:O
mortar:O
attack:O
on:O
Tan:building-other
Son:building-other
Nhut:building-other
Air:building-other
Base:building-other
killed:O
four:O
U.S:location-GPE
.:location-GPE
personnel:O
and:O
wounded:O
21:O
and:O
damaged:O
base:O
buildings:O
.:O