With no explanation, label each line with "O", "location-road/railway/highway/transit", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
performance
metric
of
fault-free
running
was
achieved
six
months
ahead
of
schedule
,
clearing
the
way
for
a
'preview
'
service
to
be
offered
between
London
St
Pancras
and
Ashford
via
Ebbsfleet
.
The:O
performance:O
metric:O
of:O
fault-free:O
running:O
was:O
achieved:O
six:O
months:O
ahead:O
of:O
schedule:O
,:O
clearing:O
the:O
way:O
for:O
a:O
'preview:O
':O
service:O
to:O
be:O
offered:O
between:O
London:location-road/railway/highway/transit
St:location-road/railway/highway/transit
Pancras:location-road/railway/highway/transit
and:O
Ashford:location-road/railway/highway/transit
via:O
Ebbsfleet:location-road/railway/highway/transit
.:O