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 ":".
This
was
a
measure
taken
to
preserve
a
European
balance
of
power
.
This:O
was:O
a:O
measure:O
taken:O
to:O
preserve:O
a:O
European:location-GPE
balance:O
of:O
power:O
.:O