With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
A
program
written
for
the
IBM
650
used
front
panel
switches
and
lights
for
the
user
interface
.
A:O
program:O
written:O
for:O
the:O
IBM:product-software
650:product-software
used:O
front:O
panel:O
switches:O
and:O
lights:O
for:O
the:O
user:O
interface:O
.:O