With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Ten
days
before
the
attack
on
Georgi
Markov
another
Bulgarian
defector
,
Vladimir
Kostov
,
survived
a
similar
attack
.
Ten:O
days:O
before:O
the:O
attack:O
on:O
Georgi:person-other
Markov:person-other
another:O
Bulgarian:location-GPE
defector:O
,:O
Vladimir:person-other
Kostov:person-other
,:O
survived:O
a:O
similar:O
attack:O
.:O