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
passage
is
difficult
to
navigate
as
ships
may
founder
on
the
reefs
and
kelp
lying
off
the
surrounding
islands
.
The:O
passage:O
is:O
difficult:O
to:O
navigate:O
as:O
ships:O
may:O
founder:O
on:O
the:O
reefs:O
and:O
kelp:O
lying:O
off:O
the:O
surrounding:O
islands:O
.:O