With no explanation, label each line with "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Before
the
2004
Summer
Olympics
he
had
not
been
considered
as
a
favourite
in
a
welterweight
division
.
Before:O
the:O
2004:event-sportsevent
Summer:event-sportsevent
Olympics:event-sportsevent
he:O
had:O
not:O
been:O
considered:O
as:O
a:O
favourite:O
in:O
a:O
welterweight:O
division:O
.:O