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 ":".
Themes
were
suggested
and
heightened
by
early
tourism
promoters
,
the
beginnings
of
the
area
's
preservation
and
the
rise
of
the
environmental
movement
.
Themes:O
were:O
suggested:O
and:O
heightened:O
by:O
early:O
tourism:O
promoters:O
,:O
the:O
beginnings:O
of:O
the:O
area:O
's:O
preservation:O
and:O
the:O
rise:O
of:O
the:O
environmental:O
movement:O
.:O