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 ":".
It
runs
underground
in
central
London
through
St
Pancras
,
Farringdon
,
City
Thameslink
and
Blackfriars
.
It:O
runs:O
underground:O
in:O
central:O
London:location-GPE
through:O
St:location-GPE
Pancras:location-GPE
,:O
Farringdon:location-GPE
,:O
City:location-GPE
Thameslink:location-GPE
and:O
Blackfriars:location-GPE
.:O