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 ":".
Problems
with
the
design
of
ammunition
lead
to
production
being
discontinued
in
1950
.
Problems:O
with:O
the:O
design:O
of:O
ammunition:O
lead:O
to:O
production:O
being:O
discontinued:O
in:O
1950:O
.:O