With no explanation, label each line with "location-GPE", "O", "event-protest", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
After
the
initial
period
of
instability
that
followed
the
1917
Russian
Revolution
against
the
Imperial
Government
,
the
Hydrographic
Office
slowly
returned
to
its
duties
as
the
situation
calmed
down
and
the
Soviet
takeover
was
completed
.
After:O
the:O
initial:O
period:O
of:O
instability:O
that:O
followed:O
the:O
1917:event-protest
Russian:event-protest
Revolution:event-protest
against:O
the:O
Imperial:O
Government:O
,:O
the:O
Hydrographic:organization-other
Office:organization-other
slowly:O
returned:O
to:O
its:O
duties:O
as:O
the:O
situation:O
calmed:O
down:O
and:O
the:O
Soviet:location-GPE
takeover:O
was:O
completed:O
.:O