With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
a
major
reservoir
on
the
Kano
River
,
the
main
tributary
of
the
Hadejia
River
.
It:O
is:O
a:O
major:O
reservoir:O
on:O
the:O
Kano:location-bodiesofwater
River:location-bodiesofwater
,:O
the:O
main:O
tributary:O
of:O
the:O
Hadejia:location-bodiesofwater
River:location-bodiesofwater
.:O