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 ":".
The
slabs
are
struck
with
a
hammer
and
played
melodically
.
The:O
slabs:O
are:O
struck:O
with:O
a:O
hammer:O
and:O
played:O
melodically:O
.:O