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 ":".
A
simpler
and
much
more
practical
solution
proved
to
be
to
attack
from
below
,
using
a
Lewis
gun
firing
a
mixture
of
explosive
and
incendiary
ammunition
at
an
upwards
angle
of
45°
.
A:O
simpler:O
and:O
much:O
more:O
practical:O
solution:O
proved:O
to:O
be:O
to:O
attack:O
from:O
below:O
,:O
using:O
a:O
Lewis:product-weapon
gun:product-weapon
firing:O
a:O
mixture:O
of:O
explosive:O
and:O
incendiary:O
ammunition:O
at:O
an:O
upwards:O
angle:O
of:O
45°:O
.:O