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 ":".
During
potlatch
,
copper
pieces
would
be
brought
out
,
and
bids
were
placed
on
them
by
rival
chiefs
.
During:O
potlatch:O
,:O
copper:O
pieces:O
would:O
be:O
brought:O
out:O
,:O
and:O
bids:O
were:O
placed:O
on:O
them:O
by:O
rival:O
chiefs:O
.:O