With no explanation, label each line with "O", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Prior
to
the
introduction
of
interleague
play
,
the
Reds
and
Indians
had
only
met
in
spring
training
or
other
exhibition
games
.
Prior:O
to:O
the:O
introduction:O
of:O
interleague:O
play:O
,:O
the:O
Reds:organization-sportsteam
and:O
Indians:organization-sportsteam
had:O
only:O
met:O
in:O
spring:O
training:O
or:O
other:O
exhibition:O
games:O
.:O