With no explanation, label each line with "location-GPE", "O", "organization-politicalparty", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Greens
were
the
first
to
form
a
political
party
at
European
level
.
The:O
Greens:organization-politicalparty
were:O
the:O
first:O
to:O
form:O
a:O
political:O
party:O
at:O
European:location-GPE
level:O
.:O