With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
produced
by
the
BBC
and
first
broadcast
in
four
weekly
parts
between
29
September
1979
and
20
October
1979
on
BBC1
.
It:O
was:O
produced:O
by:O
the:O
BBC:organization-company
and:O
first:O
broadcast:O
in:O
four:O
weekly:O
parts:O
between:O
29:O
September:O
1979:O
and:O
20:O
October:O
1979:O
on:O
BBC1:O
.:O