With no explanation, label each line with "person-athlete", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Sekorski
made
his
professional
debut
on
January
21
,
1981
,
with
a
four-round
decision
win
against
Rick
Kellar
.
Sekorski:person-athlete
made:O
his:O
professional:O
debut:O
on:O
January:O
21:O
,:O
1981:O
,:O
with:O
a:O
four-round:O
decision:O
win:O
against:O
Rick:person-athlete
Kellar:person-athlete
.:O