With no explanation, label each line with "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-hospital" or "building-hotel" preceded by ":".
London
Stansted
Airport
is
accessible
by
the
airlink
coach
.
London:building-airport
Stansted:building-airport
Airport:building-airport
is:O
accessible:O
by:O
the:O
airlink:O
coach:O
.:O