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 ":".
On
17
September
1950
a
memorial
for
the
allied
pilots
was
unveiled
in
the
park
next
to
the
town
hall
.
On:O
17:O
September:O
1950:O
a:O
memorial:O
for:O
the:O
allied:O
pilots:O
was:O
unveiled:O
in:O
the:O
park:O
next:O
to:O
the:O
town:O
hall:O
.:O