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 ":".
Chimneys
to
such
devices
can
become
blocked
,
and
so
the
gas
can
enter
living
spaces
.
Chimneys:product-other
to:O
such:O
devices:O
can:O
become:O
blocked:O
,:O
and:O
so:O
the:O
gas:O
can:O
enter:O
living:O
spaces:O
.:O