With no explanation, label each line with "location-GPE", "building-other", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
four
12-inch
M1890
mortars
and
two
6-inch
Armstrong
guns
at
Fort
De
Soto
are
the
only
weapons
of
their
type
remaining
in
the
United
States
.
The:O
four:O
12-inch:O
M1890:O
mortars:O
and:O
two:O
6-inch:O
Armstrong:product-weapon
guns:product-weapon
at:O
Fort:building-other
De:building-other
Soto:building-other
are:O
the:O
only:O
weapons:O
of:O
their:O
type:O
remaining:O
in:O
the:O
United:location-GPE
States:location-GPE
.:O