With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
minimum
number
of
signatures
to
qualify
a
recall
,
and
the
time
limit
to
do
so
,
vary
among
the
states
.
The:O
minimum:O
number:O
of:O
signatures:O
to:O
qualify:O
a:O
recall:O
,:O
and:O
the:O
time:O
limit:O
to:O
do:O
so:O
,:O
vary:O
among:O
the:O
states:O
.:O