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 ":".
A
steam
accumulator
is
an
insulated
steel
pressure
tank
containing
hot
water
and
steam
under
pressure
.
A:O
steam:O
accumulator:O
is:O
an:O
insulated:O
steel:O
pressure:O
tank:O
containing:O
hot:O
water:O
and:O
steam:O
under:O
pressure:O
.:O