With no explanation, label each line with "location-GPE", "O", "organization-religion", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
He
also
began
using
Marxist
methods
to
study
Peru
.
He:O
also:O
began:O
using:O
Marxist:organization-religion
methods:O
to:O
study:O
Peru:location-GPE
.:O