With no explanation, label each line with "O", "product-ship", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Ton-class
coastal
minesweepers
were
constructed
with
wooden
hulls
and
almost
all
of
their
structure
was
made
from
aluminium
to
reduce
their
magnetic
signature
to
aid
sweeping
magnetic
mines
.
The:O
Ton-class:product-ship
coastal:product-ship
minesweepers:product-ship
were:O
constructed:O
with:O
wooden:O
hulls:O
and:O
almost:O
all:O
of:O
their:O
structure:O
was:O
made:O
from:O
aluminium:O
to:O
reduce:O
their:O
magnetic:O
signature:O
to:O
aid:O
sweeping:O
magnetic:O
mines:O
.:O