With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
To
do
so
its
main
weapon
systems
are
the
Leopard
2
Mark
A6
,
main
battle
tank
,
the
Marder
infantry
fighting
vehicle
and
the
PzH
2000
howitzer
.
To:O
do:O
so:O
its:O
main:O
weapon:O
systems:O
are:O
the:O
Leopard:product-weapon
2:product-weapon
Mark:product-weapon
A6:product-weapon
,:O
main:O
battle:O
tank:O
,:O
the:O
Marder:product-weapon
infantry:O
fighting:O
vehicle:O
and:O
the:O
PzH:product-weapon
2000:product-weapon
howitzer:O
.:O