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 ":".
When
Soviet
forces
finally
freed
Prague
from
Nazi
control
the
Communist
Party
began
to
rise
.
When:O
Soviet:O
forces:O
finally:O
freed:O
Prague:location-GPE
from:O
Nazi:O
control:O
the:O
Communist:organization-politicalparty
Party:organization-politicalparty
began:O
to:O
rise:O
.:O