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 ":".
T-60
and
KV
tank
chassis
underwent
trials
,
but
only
the
T-34
was
deemed
to
have
a
sufficiently
robust
transmission
and
clutch
.
T-60:product-weapon
and:O
KV:product-weapon
tank:product-weapon
chassis:O
underwent:O
trials:O
,:O
but:O
only:O
the:O
T-34:product-weapon
was:O
deemed:O
to:O
have:O
a:O
sufficiently:O
robust:O
transmission:O
and:O
clutch:O
.:O