With no explanation, label each line with "building-library", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
branch
,
which
opened
in
May
1929
,
was
the
sixth
NPL
branch
to
open
between
1923
and
1946
.
The:O
branch:O
,:O
which:O
opened:O
in:O
May:O
1929:O
,:O
was:O
the:O
sixth:O
NPL:building-library
branch:O
to:O
open:O
between:O
1923:O
and:O
1946:O
.:O