With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
was
challenged
in
the
primaries
by
two
congressmen
:
anti-war
candidate
Pete
McCloskey
and
détente
opponent
John
Ashbrook
.
He:O
was:O
challenged:O
in:O
the:O
primaries:O
by:O
two:O
congressmen:O
::O
anti-war:O
candidate:O
Pete:person-politician
McCloskey:person-politician
and:O
détente:O
opponent:O
John:person-politician
Ashbrook:person-politician
.:O