With no explanation, label each line with "location-GPE", "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
1903
,
the
city
of
San
Francisco
proposed
building
a
hydroelectric
dam
to
flood
Hetch
Hetchy
Valley
.
In:O
1903:O
,:O
the:O
city:O
of:O
San:location-GPE
Francisco:location-GPE
proposed:O
building:O
a:O
hydroelectric:O
dam:O
to:O
flood:O
Hetch:location-other
Hetchy:location-other
Valley:location-other
.:O