With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Polystyrene
is
one
of
the
most
widely
used
plastics
,
the
scale
of
its
production
being
several
million
tonnes
per
year
.
Polystyrene:other-chemicalthing
is:O
one:O
of:O
the:O
most:O
widely:O
used:O
plastics:O
,:O
the:O
scale:O
of:O
its:O
production:O
being:O
several:O
million:O
tonnes:O
per:O
year:O
.:O