With no explanation, label each line with "O", "other-educationaldegree", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
After
his
return
to
the
University
of
Vienna
he
achieved
the
habilitation
for
organic
chemistry
in
1959
.
After:O
his:O
return:O
to:O
the:organization-education
University:organization-education
of:organization-education
Vienna:organization-education
he:O
achieved:O
the:other-educationaldegree
habilitation:other-educationaldegree
for:other-educationaldegree
organic:other-educationaldegree
chemistry:other-educationaldegree
in:O
1959:O
.:O