With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
After
intensive
anti-poaching
measures
were
introduced
by
park
authorities
,
poaching
stopped
almost
completely
by
the
end
of
1983
.
After:O
intensive:O
anti-poaching:O
measures:O
were:O
introduced:O
by:O
park:O
authorities:O
,:O
poaching:O
stopped:O
almost:O
completely:O
by:O
the:O
end:O
of:O
1983:O
.:O