With no explanation, label each line with "location-GPE", "O", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
At
the
time
of
the
1980
eruption
of
Mount
St.
Helens
the
summit
of
the
volcano
that
was
blasted
away
was
owned
by
Burlington
Northern
.
At:O
the:O
time:O
of:O
the:O
1980:O
eruption:O
of:O
Mount:location-mountain
St.:location-mountain
Helens:location-mountain
the:O
summit:O
of:O
the:O
volcano:O
that:O
was:O
blasted:O
away:O
was:O
owned:O
by:O
Burlington:location-GPE
Northern:location-GPE
.:O