With no explanation, label each line with "O", "event-other", "person-scholar", "location-mountain", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Gan
was
a
Red
Guard
in
the
early
years
of
the
Cultural
Revolution
,
but
became
disillusioned
with
the
movement
and
was
sent
to
labour
in
the
Greater
Khingan
Mountains
in
1970
.
Gan:person-scholar
was:O
a:O
Red:O
Guard:O
in:O
the:O
early:O
years:O
of:O
the:O
Cultural:event-other
Revolution:event-other
,:O
but:O
became:O
disillusioned:O
with:O
the:O
movement:O
and:O
was:O
sent:O
to:O
labour:O
in:O
the:O
Greater:location-mountain
Khingan:location-mountain
Mountains:location-mountain
in:O
1970:O
.:O