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 ":".
Thus
,
the
1860
presidential
election
essentially
consisted
of
two
separate
campaigns
.
Thus:O
,:O
the:O
1860:O
presidential:O
election:O
essentially:O
consisted:O
of:O
two:O
separate:O
campaigns:O
.:O