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 ":".
Much
of
his
work
was
given
over
to
a
historical
revisionism
that
sought
to
counter
liberal
interpretations
of
history
.
Much:O
of:O
his:O
work:O
was:O
given:O
over:O
to:O
a:O
historical:O
revisionism:O
that:O
sought:O
to:O
counter:O
liberal:O
interpretations:O
of:O
history:O
.:O