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 ":".
In
the
Middle
Ages
,
the
trebuchet
was
developed
.
In:O
the:O
Middle:O
Ages:O
,:O
the:O
trebuchet:O
was:O
developed:O
.:O