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 ":".
Mainline
freight
work
commonly
used
the
ex
Great
Central
Robinson
2-8-0
locomotives
(
later
classified
as
LNER
Class
O4
)
.
Mainline:O
freight:O
work:O
commonly:O
used:O
the:O
ex:O
Great:product-train
Central:product-train
Robinson:product-train
2-8-0:product-train
locomotives:O
(:O
later:O
classified:O
as:O
LNER:product-train
Class:product-train
O4:product-train
):O
.:O