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 ":".
The
company
's
charter
required
it
to
construct
two
tramways
to
improve
transport
.
The:O
company:O
's:O
charter:O
required:O
it:O
to:O
construct:O
two:O
tramways:O
to:O
improve:O
transport:O
.:O