With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
serves
as
the
home
base
for
Tunisair
,
Tunisair
Express
,
Nouvelair
Tunisia
,
and
Tunisavia
.
It:O
serves:O
as:O
the:O
home:O
base:O
for:O
Tunisair:organization-company
,:O
Tunisair:organization-company
Express:organization-company
,:O
Nouvelair:organization-company
Tunisia:organization-company
,:O
and:O
Tunisavia:organization-company
.:O