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 ":".
Production
was
restarted
in
April
1942
with
a
total
of
132
built
during
the
year
.
Production:O
was:O
restarted:O
in:O
April:O
1942:O
with:O
a:O
total:O
of:O
132:O
built:O
during:O
the:O
year:O
.:O