With no explanation, label each line with "O", "person-scholar", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Gan
then
pursued
graduate
studies
in
philosophy
at
Peking
University
,
where
he
was
a
classmate
of
Liu
Xiaofeng
.
Gan:person-scholar
then:O
pursued:O
graduate:O
studies:O
in:O
philosophy:O
at:O
Peking:organization-education
University:organization-education
,:O
where:O
he:O
was:O
a:O
classmate:O
of:O
Liu:person-scholar
Xiaofeng:person-scholar
.:O