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 ":".
The
United
States
has
been
heavily
involved
in
the
conflict
since
its
beginnings
,
when
in
the
early
1960s
the
U.S
.
government
encouraged
the
Colombian
military
to
attack
leftist
militias
in
rural
Colombia
.
The:O
United:location-GPE
States:location-GPE
has:O
been:O
heavily:O
involved:O
in:O
the:O
conflict:O
since:O
its:O
beginnings:O
,:O
when:O
in:O
the:O
early:O
1960s:O
the:O
U.S:location-GPE
.:location-GPE
government:O
encouraged:O
the:O
Colombian:location-GPE
military:O
to:O
attack:O
leftist:O
militias:O
in:O
rural:O
Colombia:location-GPE
.:O