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 ":".
Early
steel
AK-47
magazines
are
long
,
and
the
later
ribbed
steel
AKM
and
newer
plastic
7.62×39mm
magazines
are
about
shorter
.
Early:O
steel:O
AK-47:product-weapon
magazines:O
are:O
long:O
,:O
and:O
the:O
later:O
ribbed:O
steel:O
AKM:product-weapon
and:O
newer:O
plastic:O
7.62×39mm:product-weapon
magazines:product-weapon
are:O
about:O
shorter:O
.:O