With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
However
,
a
relatively
small
number
of
these
were
employed
due
to
concerns
about
the
poor
quality
of
roads
in
Japan
,
as
many
Japanese
roads
were
unpaved
and
poorly
maintained
,
limiting
the
feasibility
of
wheeled
vehicles
for
military
service
.
However:O
,:O
a:O
relatively:O
small:O
number:O
of:O
these:O
were:O
employed:O
due:O
to:O
concerns:O
about:O
the:O
poor:O
quality:O
of:O
roads:O
in:O
Japan:location-GPE
,:O
as:O
many:O
Japanese:location-GPE
roads:O
were:O
unpaved:O
and:O
poorly:O
maintained:O
,:O
limiting:O
the:O
feasibility:O
of:O
wheeled:O
vehicles:O
for:O
military:O
service:O
.:O