With no explanation, label each line with "O", "location-bodiesofwater", "person-scholar", "location-GPE", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
After
serving
in
several
assignments
,
including
conduct
of
a
survey
of
the
Pacific
Coast
of
Mexico
and
Central
America
,
Walling
served
as
an
instructor
in
the
department
of
physics
and
chemistry
at
the
United
States
Naval
Academy
from
December
1886
until
September
1892
.
After:O
serving:O
in:O
several:O
assignments:O
,:O
including:O
conduct:O
of:O
a:O
survey:O
of:O
the:O
Pacific:location-bodiesofwater
Coast:location-bodiesofwater
of:location-bodiesofwater
Mexico:location-bodiesofwater
and:O
Central:location-GPE
America:location-GPE
,:O
Walling:person-scholar
served:O
as:O
an:O
instructor:O
in:O
the:O
department:O
of:O
physics:O
and:O
chemistry:O
at:O
the:O
United:organization-education
States:organization-education
Naval:organization-education
Academy:organization-education
from:O
December:O
1886:O
until:O
September:O
1892:O
.:O