With no explanation, label each line with "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Northfield
Mountains
'
geologic
story
can
begin
in
the
late
pre-Cambrian
Period
.
Northfield:location-mountain
Mountains:location-mountain
':O
geologic:O
story:O
can:O
begin:O
in:O
the:O
late:O
pre-Cambrian:O
Period:O
.:O