With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
driver
looked
through
three
M27
day
periscopes
,
one
of
which
could
be
replaced
by
a
night
vision
periscope
.
The:O
driver:O
looked:O
through:O
three:O
M27:product-other
day:O
periscopes:O
,:O
one:O
of:O
which:O
could:O
be:O
replaced:O
by:O
a:O
night:O
vision:O
periscope:O
.:O