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 ":".
The
new
modernization
was
an
attempt
to
solve
these
problems
by
using
a
modern
split
trail
carriage
of
the
122-mm
gun
M1931
.
The:O
new:O
modernization:O
was:O
an:O
attempt:O
to:O
solve:O
these:O
problems:O
by:O
using:O
a:O
modern:O
split:O
trail:O
carriage:O
of:O
the:O
122-mm:product-weapon
gun:product-weapon
M1931:product-weapon
.:O