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 ":".
In
1965
he
resigned
his
senatorial
seat
to
become
Chile
's
ambassador
to
the
United
States
(
4
March
1965
–
April
1968
)
.
In:O
1965:O
he:O
resigned:O
his:O
senatorial:O
seat:O
to:O
become:O
Chile:location-GPE
's:O
ambassador:O
to:O
the:location-GPE
United:location-GPE
States:location-GPE
(:O
4:O
March:O
1965:O
–:O
April:O
1968:O
):O
.:O