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 ":".
Around
the
lake
,
geologists
found
evidence
of
massive
local
extinctions
about
every
thousand
years
,
presumably
caused
by
outgassing
events
.
Around:O
the:O
lake:O
,:O
geologists:O
found:O
evidence:O
of:O
massive:O
local:O
extinctions:O
about:O
every:O
thousand:O
years:O
,:O
presumably:O
caused:O
by:O
outgassing:O
events:O
.:O