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 ":".
Two
objects
may
appear
visually
identical
but
may
be
distinguished
through
examination
of
their
spectral
properties
.
Two:O
objects:O
may:O
appear:O
visually:O
identical:O
but:O
may:O
be:O
distinguished:O
through:O
examination:O
of:O
their:O
spectral:O
properties:O
.:O