With no explanation, label each line with "O", "product-train", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
220s
and
221s
can
also
be
easily
assisted
by
Dellner
fitted
Class
57s
(
Thunderbirds
)
in
the
event
of
a
failure
.
220s:product-train
and:O
221s:product-train
can:O
also:O
be:O
easily:O
assisted:O
by:O
Dellner:product-train
fitted:product-train
Class:product-train
57s:product-train
(:product-train
Thunderbirds:product-train
):product-train
in:O
the:O
event:O
of:O
a:O
failure:O
.:O