With no explanation, label each line with "location-GPE", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Switzerland
becomes
the
``
protecting
power
''
of
the
United
States
in
Iran
after
the
Iranian
Revolution
of
1979
.
Switzerland:location-GPE
becomes:O
the:O
``:O
protecting:O
power:O
'':O
of:O
the:O
United:location-GPE
States:location-GPE
in:O
Iran:location-GPE
after:O
the:O
Iranian:event-attack/battle/war/militaryconflict
Revolution:event-attack/battle/war/militaryconflict
of:O
1979:O
.:O