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
ships
were
armed
with
one
40
mm
Bofors
gun
and
were
equipped
with
minesweeping
gear
.
The:O
ships:O
were:O
armed:O
with:O
one:O
40:product-weapon
mm:product-weapon
Bofors:product-weapon
gun:O
and:O
were:O
equipped:O
with:O
minesweeping:O
gear:O
.:O