With no explanation, label each line with "O", "location-road/railway/highway/transit", "other-law", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
1930
Britain
ratified
the
1925
Geneva
Protocol
with
reservations
,
which
permitted
the
use
of
chemical
warfare
agents
only
in
retaliation
.
In:O
1930:O
Britain:location-road/railway/highway/transit
ratified:O
the:O
1925:other-law
Geneva:other-law
Protocol:other-law
with:O
reservations:O
,:O
which:O
permitted:O
the:O
use:O
of:O
chemical:O
warfare:O
agents:O
only:O
in:O
retaliation:O
.:O