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 ":".
The
Celtics
entered
the
2001–02
season
with
low
expectations
.
The:O
Celtics:organization-sportsteam
entered:O
the:O
2001–02:O
season:O
with:O
low:O
expectations:O
.:O