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 ":".
His
first
duty
station
was
at
Swatragh
,
County
Londonderry
.
His:O
first:O
duty:O
station:O
was:O
at:O
Swatragh:location-GPE
,:O
County:location-GPE
Londonderry:location-GPE
.:O