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 ":".
Each
of
the
campaigns
centers
on
a
faction
leader
,
and
tells
the
story
of
how
that
leader
came
to
prominence
.
Each:O
of:O
the:O
campaigns:O
centers:O
on:O
a:O
faction:O
leader:O
,:O
and:O
tells:O
the:O
story:O
of:O
how:O
that:O
leader:O
came:O
to:O
prominence:O
.:O