With no explanation, label each line with "O", "person-scholar", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Hayek
considered
Knight
to
be
one
of
the
major
figures
in
preserving
and
promoting
classical
liberal
thought
in
the
twentieth
century
.
Hayek:O
considered:O
Knight:person-scholar
to:O
be:O
one:O
of:O
the:O
major:O
figures:O
in:O
preserving:O
and:O
promoting:O
classical:O
liberal:O
thought:O
in:O
the:O
twentieth:O
century:O
.:O