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 ":".
He
returned
to
Al-Ittihad
on
13
January
2010
.
He:O
returned:O
to:O
Al-Ittihad:organization-sportsteam
on:O
13:O
January:O
2010:O
.:O