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
ongoing
``
Helgisaga
''
project
(
1985–present
)
is
a
good
example
of
this
mode
of
operation
.
The:O
ongoing:O
``:O
Helgisaga:O
'':O
project:O
(:O
1985–present:O
):O
is:O
a:O
good:O
example:O
of:O
this:O
mode:O
of:O
operation:O
.:O