With no explanation, label each line with "O", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
For
example
,
the
behavior
of
underground
walls
has
been
evaluated
for
the
Northridge
earthquake
using
numerical
methods
.
For:O
example:O
,:O
the:O
behavior:O
of:O
underground:O
walls:O
has:O
been:O
evaluated:O
for:O
the:O
Northridge:event-disaster
earthquake:event-disaster
using:O
numerical:O
methods:O
.:O