With no explanation, label each line with "location-GPE", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
The
northbound
flight
left
Croydon
in
the
late
afternoon
and
the
southbound
flight
departed
Alexandra
Park
during
the
next
morning
.
The:O
northbound:O
flight:O
left:O
Croydon:location-GPE
in:O
the:O
late:O
afternoon:O
and:O
the:O
southbound:O
flight:O
departed:O
Alexandra:building-airport
Park:building-airport
during:O
the:O
next:O
morning:O
.:O