With no explanation, label each line with "location-GPE", "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Following
the
closure
of
Trawsfynydd
in
1991
,
Wylfa
became
Wales
'
only
nuclear
power
station
.
Following:O
the:O
closure:O
of:O
Trawsfynydd:building-other
in:O
1991:O
,:O
Wylfa:building-other
became:O
Wales:location-GPE
':O
only:O
nuclear:O
power:O
station:O
.:O