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 ":".
His
closest
collaborator
was
Juliusz
Mieroszewski
,
who
provided
the
theoretical
justification
for
Polish
recognition
of
the
borders
with
Ukraine
,
Belarus
,
and
Lithuania
(
whose
future
independence
he
predicted
long
before
it
came
about
)
.
His:O
closest:O
collaborator:O
was:O
Juliusz:person-other
Mieroszewski:person-other
,:O
who:O
provided:O
the:O
theoretical:O
justification:O
for:O
Polish:location-GPE
recognition:O
of:O
the:O
borders:O
with:O
Ukraine:location-GPE
,:O
Belarus:location-GPE
,:O
and:O
Lithuania:location-GPE
(:O
whose:O
future:O
independence:O
he:O
predicted:O
long:O
before:O
it:O
came:O
about:O
):O
.:O