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 ":".
Fighters
of
the
group
were
armed
with
Kalashnikov
rifles
,
PK
machine
guns
,
and
RPG-7s
.
Fighters:O
of:O
the:O
group:O
were:O
armed:O
with:O
Kalashnikov:product-weapon
rifles:product-weapon
,:O
PK:product-weapon
machine:product-weapon
guns:product-weapon
,:O
and:O
RPG-7s:product-weapon
.:O