With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
A
flood
alleviation
scheme
was
therefore
drawn
up
in
2002
between
flood
alleviation
authorities
.
A:O
flood:O
alleviation:O
scheme:O
was:O
therefore:O
drawn:O
up:O
in:O
2002:O
between:O
flood:O
alleviation:O
authorities:O
.:O