With no explanation, label each line with "location-GPE", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
BT
has
its
main
research
and
development
facility
at
Martlesham
Heath
.
BT:organization-company
has:O
its:O
main:O
research:O
and:O
development:O
facility:O
at:O
Martlesham:location-GPE
Heath:location-GPE
.:O