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
earliest
cultures
used
abrasive
techniques
,
and
modern
technology
employs
pneumatic
hammers
and
other
devices
.
The:O
earliest:O
cultures:O
used:O
abrasive:O
techniques:O
,:O
and:O
modern:O
technology:O
employs:O
pneumatic:O
hammers:O
and:O
other:O
devices:O
.:O