With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Huerta
government
was
thus
challenged
by
revolutionary
forces
in
the
north
of
Mexico
and
in
the
strategic
state
of
Morelos
,
just
south
of
the
capital
.
The:O
Huerta:person-politician
government:O
was:O
thus:O
challenged:O
by:O
revolutionary:O
forces:O
in:O
the:O
north:O
of:O
Mexico:location-GPE
and:O
in:O
the:O
strategic:O
state:O
of:O
Morelos:location-GPE
,:O
just:O
south:O
of:O
the:O
capital:O
.:O