With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
At
the
height
of
freight
ferry
operations
,
Santa
Fe
tugs
and
barges
called
at
many
slips
around
the
bay
.
At:O
the:O
height:O
of:O
freight:O
ferry:O
operations:O
,:O
Santa:location-GPE
Fe:location-GPE
tugs:O
and:O
barges:O
called:O
at:O
many:O
slips:O
around:O
the:O
bay:O
.:O