With no explanation, label each line with "location-GPE", "O", "other-law", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Then
the
last
vestiges
of
Canada
's
constitutional
dependency
upon
Britain
remained
until
Canadians
from
various
provinces
agreed
on
an
internal
procedure
for
amending
the
Canadian
Constitution
.
Then:O
the:O
last:O
vestiges:O
of:O
Canada:location-GPE
's:O
constitutional:O
dependency:O
upon:O
Britain:location-GPE
remained:O
until:O
Canadians:O
from:O
various:O
provinces:O
agreed:O
on:O
an:O
internal:O
procedure:O
for:O
amending:O
the:O
Canadian:other-law
Constitution:other-law
.:O