With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Their
first
product
was
shown
to
potential
users
who
were
polled
as
to
what
they
would
be
willing
to
pay
for
it
.
Their:O
first:O
product:O
was:O
shown:O
to:O
potential:O
users:O
who:O
were:O
polled:O
as:O
to:O
what:O
they:O
would:O
be:O
willing:O
to:O
pay:O
for:O
it:O
.:O