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 ":".
Unlike
its
historic
counterpart
,
which
had
only
the
two
side
guns
,
the
tank
had
a
turret
gun
added
as
well
.
Unlike:O
its:O
historic:O
counterpart:O
,:O
which:O
had:O
only:O
the:O
two:O
side:O
guns:O
,:O
the:O
tank:O
had:O
a:O
turret:O
gun:O
added:O
as:O
well:O
.:O