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 ":".
After
it
was
used
against
a
major
school
on
a
national
stage
in
this
game
,
the
forward
pass
rapidly
gained
popularity
.
After:O
it:O
was:O
used:O
against:O
a:O
major:O
school:O
on:O
a:O
national:O
stage:O
in:O
this:O
game:O
,:O
the:O
forward:O
pass:O
rapidly:O
gained:O
popularity:O
.:O