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 ":".
These
were
heavy
metal
mesh
nets
hung
out
on
booms
at
some
distance
from
the
sides
of
ships
to
catch
or
detonate
torpedoes
short
of
the
ship
.
These:O
were:O
heavy:O
metal:O
mesh:O
nets:O
hung:O
out:O
on:O
booms:O
at:O
some:O
distance:O
from:O
the:O
sides:O
of:O
ships:O
to:O
catch:O
or:O
detonate:O
torpedoes:O
short:O
of:O
the:O
ship:O
.:O