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 ":".
They
were
ordered
primarily
to
replace
steam
locomotives
then
still
in
use
on
CP
.
They:O
were:O
ordered:O
primarily:O
to:O
replace:O
steam:product-train
locomotives:product-train
then:O
still:O
in:O
use:O
on:O
CP:O
.:O