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 ":".
Service
was
initially
provided
by
QT
Broadway−Brighton
trains
(
predecessor
to
the
train
)
.
Service:O
was:O
initially:O
provided:O
by:O
QT:product-train
Broadway−Brighton:product-train
trains:O
(:O
predecessor:O
to:O
the:O
train:O
):O
.:O