With no explanation, label each line with "person-politician", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
They
formed
the
Confederate
States
of
America
after
Lincoln
was
elected
,
but
before
he
took
office
.
They:O
formed:O
the:O
Confederate:organization-other
States:organization-other
of:organization-other
America:organization-other
after:O
Lincoln:person-politician
was:O
elected:O
,:O
but:O
before:O
he:O
took:O
office:O
.:O